This list of all articles managed by WikiProject Geology was generated using a list generated by a Wikipedia Release Version tool. It is current as of 17 May 2012.
- 100,000-year problem
- 1575 Valdivia earthquake
- 1751 Port-au-Prince earthquake
- 1857 Basilicata earthquake
- 1906 San Francisco earthquake
- 1908 Messina earthquake
- 1931 Nicaragua earthquake
- 1949 Ambato earthquake
- 1949 Queen Charlotte Islands earthquake
- 1950 Assam – Tibet earthquake
- 1960 Valdivia earthquake
- 1967 Caracas earthquake
- 1968 Illinois earthquake
- 1971 San Fernando earthquake
- 1972 Nicaragua earthquake
- 1980 eruption of Mount St. Helens
- 1992 Landers earthquake
- 1994 Northridge earthquake
- 1997 Fiji-Tonga earthquake
- 1997 Jabalpur earthquake
- 1997 Qayen earthquake
- 1999 Chamoli earthquake
- 2002 Molise earthquake
- 2003 Boumerdès earthquake
- 2004 Indian Ocean earthquake and tsunami
- 2006 Kamchatka earthquakes
- 2007–2008 Nazko earthquakes
- 2008 Chino Hills earthquake
- 2008 Iceland earthquake
- 2008 Illinois earthquake
- 2008 Kyrgyzstan earthquake
- 2008 Panzhihua earthquake
- 2008 Sichuan earthquake
- 2008 Yingjiang earthquakes
- 2010 Baja California earthquake
- 2012 Indian Ocean earthquake
- 25143 Itokawa
- 773 Irmintraud
- A-index
- A. Morley Davies
- AAG Gold Medal
- AAPG Bulletin
- ABISMO
- AFm phase
- AL 200-1
- AL 333
- Aachenosaurus
- Aalenian
- Aarhus (meteorite)
- Abavornis
- Abecediary
- Abee (meteorite)
- Abelisaur
- Abelsonite
- Abenakiite-(Ce)
- Aber Dinlle Fault
- Aber Fault
- Aber Richard Fault
- Aberconway Medal
- Aberdaron Fault
- Abergwesyn Fault
- Abernathyite
- Aberratiodontus
- Abertridwr Fault
- Abhurite
- Abiogenesis
- Abitibi greenstone belt
- Abraham Gottlob Werner
- Abraham Ortelius
- Abraum salts
- Absaroka sequence
- Absolute dating
- Abyss Pool
- Abyssal channel
- Abyssal fan
- Abyssal hill
- Abyssal plain
- Acadian orogeny
- Acanthite
- Acanthodes
- Acanthopholis
- Acasta Gneiss
- Accretion (geology)
- Accretionary wedge
- Accumulation zone
- Acheronodon
- Acherontemys
- Achillesaurus
- Achondrite
- Acicular (crystal habit)
- Acid maceration
- Acorn Fault
- Acraman crater
- Acritarch
- Acrophoca
- Acrotemnus
- Actinocrinites
- Actinolite
- Active fault
- Acuminite
- Adakite
- Adam Dziewonski
- Adam Sedgwick
- Adamantina Formation
- Adamantine Spar
- Adamite
- Adams mammoth
- Adamsite-(Y)
- Adams–Williamson equation
- Adaptive radiation
- Adel Mountains Volcanic Field
- Adelite
- Adelobasileus
- Adelospondyli
- Adelphailurus
- Aden Ridge
- Adhi Kot (meteorite)
- Adinotherium
- Adularia
- Advanced Spaceborne Thermal Emission and Reflection Radiometer
- Aegialornis
- Aegir Ridge
- Aegirine
- Aellopos (fish)
- Aelurognathus
- Aenigmatite
- Aepycamelus
- Aerinite
- Aeromagnetic survey
- Aeronian
- Aeschynite-(Ce)
- Aeschynite-(Y)
- Aetobatus poeyi
- Aetokremnos
- Aetonyx
- Afghanite
- Afon Saint Fault
- African Plate
- African superswell
- Afro-Eurasia
- Afro-Eurasia-America
- Afterdamp
- Afwillite
- Agardite
- Agassiz Glacier
- Agate
- Age of the Earth
- Agen (meteorite)
- Ageostrophy
- Agglomerate
- Aggradation
- Aglaspidida
- Agnosphitys
- Agnostus
- Agrinierite
- Agriotherium
- Agrogeologist
- Agrogeology
- Agrominerals
- Aguilarite
- Ahlfeldite
- Ahu Akivi
- Ahu Tongariki
- Aikinite
- Ailsacrinus
- Aira Caldera
- Aivukus
- Ajoite
- Akaganéite
- Akazaki Formation
- Akbarpur (meteorite)
- Akdalaite
- Akhtenskite
- Akik
- Akilia
- Akimotoite
- Aksayan
- Aktashite
- Al-Khod Conglomerate
- Alabandite
- Alabaster
- Alacranite
- Aladdin (crater)
- Alagomyidae
- Alanah Woody
- Alarsite
- Alaska-Aleutian megathrust
- Albanerpeton
- Albareto (meteorite)
- Albert David Hager
- Albert Oppel
- Alberta Group
- Albertite
- Albian
- Albian Sands
- Albionbaataridae
- Albisaurus
- Albite
- Albrechtschraufite
- Albumares brunsae
- Alcoota
- Aldermanite
- Aleksite
- Alert Bay Volcanic Belt
- Aleutian Trench
- Alexander Keyserling
- Alexis A. Julien
- Alexornis
- Alfred Church Lane
- Alfred John Jukes-Browne
- Alfred Tylor
- Alfred Wegener
- Alginite
- Algoman orogeny
- Ali Baba (crater)
- Alice Springs Orogeny
- Alismaticarpum
- Allabogdanite
- Allan Hills 84001
- Allan V. Cox
- Allanite
- Allargentum
- Allaru Formation
- Allegan (meteorite)
- Alleghanian orogeny
- Allegheny Formation
- Allegheny Front
- Allende meteorite
- Allington Quarry
- Allison Formation
- Allison Glacier (Antarctica)
- Allison Glacier (Heard Island)
- Alloa Lea Quarry Cave
- Allochem
- Allochthon
- Alloclasite
- Allophane
- Allosauridae
- Allt y Crib Fault
- Allt y Grug Fault
- Alluaudite
- Alluvial desert
- Alluvial fan
- Alluvium
- Almandine
- Almendres Cromlech
- Alocodon
- Alopecocyon
- Alpha Ridge
- Alpheus Spring Packard
- Alpine Fault
- Alpine orogeny
- Alstonite
- AltaRock Energy
- Altaite
- Altar Stone (Stonehenge)
- Altavista petroglyph complex
- Altendorf (megalithic tomb)
- Althupite
- Altispinax
- Altyn Tagh fault
- Alum Bluff Formation
- Alum shale
- Aluminite
- Aluminium silicate
- Aluminosilicate
- Alunite
- Alunogen
- Alvar
- Alvarez hypothesis
- Alvarezsaurus
- Alwyn Robbins
- Alyn Valley Fault
- Amadeus Basin
- Amagodani Formation
- Amarantite
- Amargatitanis
- Amargosa Chaos
- Amasia (continent)
- Amazon Canyon
- Amazonian shield
- Amazonite
- Ambapur Nagla
- Amber
- Ambiortus
- Amblygonite
- Amboni Caves
- Ambulocetidae
- Amelia Creek crater
- Ameribaatar
- American Association of Petroleum Geologists
- American Geophysical Union
- American–Antarctic Ridge
- Ames crater
- Amesite
- Amethyst
- Ametrine
- Amguid crater
- Amicite
- Amino acid dating
- Ammolite
- Ammonium bituminosulfonate
- Amole Formation
- Amoreira-Porto Novo Members
- Ampelomeryx
- Amphibamus
- Amphibole
- Amphibolite
- Amphicyon
- Amphoterite
- Amplectobelua
- Amplitude versus offset
- Ampthill Clay
- Amundsen Plain
- Amurian Plate
- Amygdule
- Amynodontidae
- An Introduction to the Rock-Forming Minerals
- Anachlysictis
- Anafon Fault
- Anagale
- Anahim Volcanic Belt
- Anahim hotspot
- Anakena
- Analcime
- Anancus
- Anand Mohan
- Anandite
- Anapaite
- Anastasia Formation
- Anatalavis
- Anatase
- Anatolian Plate
- Anatoly Konstantinovich Rozhdestvensky
- Ancaster stone
- Ancestral Thames
- Anchialine cave
- Anchialine pool
- Anchisauria
- Anchisauridae
- Anchitheriomys
- Anchitherium
- Ancistrocrania
- Ancylite
- Ancylopoda
- Ancylus Lake
- Andalusite
- Andean Geology
- Andersonite
- Andesite
- Andinichthyidae
- Andorite
- Andradite
- Andrew H. Knoll
- Andrew Ketcham Barnett
- Andrew Long
- Andrias scheuchzeri
- Andrija Mohorovičić
- André Cailleux
- Andura
- Anelastic attenuation factor
- Anfesta stankovskii
- Angadipuram Laterite
- Angers (meteorite)
- Anglesite
- Angloposeidon
- Angono Petroglyphs
- Angostura Colorada Formation
- Angoumian
- Angrite
- Angwa Sandstone Formation
- Anhydrite
- Aniksosaurus
- Animikie Group
- Anisian
- Ankalagon saurognathus
- Ankarafantsika Formation
- Ankazomihaboka Formation
- Ankerite
- Ankober (meteorite)
- Anlong (meteorite)
- Annabergite
- Annite
- Annual Review of Earth and Planetary Sciences
- Anomalocaridid
- Anomalocaris
- Anomocephalus
- Anomoepus
- Anoplotheriidae
- Anorthite
- Anorthosite
- Anoxic event
- Anta Grande do Zambujeiro
- Antarctic Plate
- Antarctic continental shelf
- Antarcticite
- Anteclise
- Antediluvian
- Anthodite
- Anthophyllite
- Anthracite
- Anthraconite
- Anthracosaurus
- Anthracotheriidae
- Anthracotherium
- Anthrocene
- Anthropic rock
- Anthropocene
- Anthropodyptes
- Anthropornis
- Antiarchi
- Anticline
- Antidune
- Antitaenite
- Antler orogeny
- Antonin Fritsch
- Antrim Shale
- Anyolite
- Aorounga crater
- Aouelloul crater
- Apachite
- Apateodus
- Apateopholis
- Apatite
- Apatodon
- Apatornis
- Apennine Mountains
- Aphaneramma
- Aphanite
- Aphthoroblattina
- Apidium
- Apiocrinites
- Aplite
- Apophyllite-(KF)
- Appalachia (Mesozoic)
- Apparent polar wander
- Appekunny Formation
- Appley Bridge meteorite
- April 2010 Sumatra earthquake
- Apsaravis
- Aptian
- Aptian extinction
- Apulian Plate
- Aquifer
- Aquifers in the United States
- Aquitanian (stage)
- Aquitard
- Arabian-Nubian Shield
- Arabian Plate
- Aragonite
- Aragosaurus
- Araguainha crater
- Arandaspida
- Arandaspis
- Arapahoe Formation
- Arbol Solo (meteorite)
- Arcadia Formation
- Archaea
- Archaeocidaris
- Archaeodontosaurus
- Archaeogeryon
- Archaeohyracidae
- Archaeomagnetic dating
- Archaeomeryx
- Archaeopithecidae
- Archaeopsittacus
- Archaeopterygidae
- Archaeopterygiformes
- Archaeopteryx
- Archaeorhynchus
- Archaeornithomimus
- Archaeospheniscus
- Archaeospheniscus lowei
- Archaeospheniscus wimani
- Archaeosyodon
- Archaeotrogonidae
- Archaeovenator
- Archean
- Archean life in the Barberton Greenstone Belt
- Archegosaurus
- Archeolimulus
- Archeriidae
- Archetypomys
- Archibald Geikie
- Archie's law
- Archie (meteorite)
- Archimylacris
- Archipelagic apron
- Arcillas de Morella Formation
- Arctic (journal)
- Arctic Cordillera
- Arctic Lowlands
- Arctic geoengineering
- Arctica
- Arctognathus
- Arctops
- Arcubisite
- Ardaite
- Ardgroom
- Arenicolites
- Arenig
- Arenite
- Arfvedsonite
- Argana Formation
- Arganaceras
- Argentite
- Argiles d'Octeville
- Argiles de Chatillon Formation
- Argiles du Gault
- Argillaceous minerals
- Argillaceous schist
- Argutite
- Argyrodite
- Argyrolagus
- Argyrosaurus
- Aristosuchus
- Arizona Accelerator Mass Spectrometry Laboratory
- Arizona Geological Society
- Arizona Geological Survey
- Arizona Mining and Mineral Museum
- Arkarua
- Arkenu structures
- Arkose
- Armalcolite
- Armor (hydrology)
- Armorican terrane
- Armour (anatomy)
- Arnold Hague
- Arnold Henry Guyot
- Arnold von Lasaulx
- Arroyo Aguiar (meteorite)
- Arsenate minerals
- Arsenite minerals
- Arsenopyrite
- Artesian aquifer
- Arthog – Caerdeon Fault
- Arthur Edmund Seaman
- Arthur Holmes
- Arthur L. Day Prize and Lectureship
- Arthurite
- Artificial reef
- Artinite
- Artinskian
- Artoles Formation
- Arundel Formation
- Arundian
- Arville Irving Levorsen
- Arête
- Asama Volcano Museum
- Asbestos
- Asencio Formation
- Ashburtonite
- Ashfield Brick Pits
- Ashizawa Formation
- Ashoverite
- Ashstone
- Asiaceratops
- Asiahesperornis
- Asiamerica
- Asiamericana
- Asiatosaurus
- Aso Rock
- Aspen Mountain (Wyoming)
- Asperity (geotechnical engineering)
- Aspidella
- Aspidorhynchiformes
- Aspidorhynchus
- Aspy Fault
- Asselian
- Assise
- Assisi (meteorite)
- Association for Women Geoscientists
- Association of American Geologists and Naturalists
- Association of American State Geologists
- Association of Applied Geochemists
- Association of Environmental & Engineering Geologists
- Asteroid
- Asthenosphere
- Astrapotheria
- Astrapotherium
- Astraspida
- Astraspis
- Astrochronology
- Astrodon
- Astrogeology Research Program
- Astronomy & Geophysics
- Astronomy and Geophysics
- Astrophyllite
- Asylosaurus
- Atacamite
- Ataxite
- Atdabanian
- Ateleaspis
- Athabasca Basin
- Athabascaite
- Atlantic coastal plain
- Atlantica
- Atlantis Massif
- Atlantosaurus
- Atlascopcosaurus
- Atmosphere of Earth
- Atrypa
- Attrition (weathering)
- Aubrey holes
- Aubrite
- Auca Mahuevo
- Aucasaurus
- Auerlite
- Augen
- Augite
- August Breithaupt
- Auguste Michel-Lévy
- Aulacocephalodon
- Aulacogen
- Aulophyseter
- Aurelia and Blue Moon
- Aurichalcite
- Auricupride
- Aurostibite
- Ausia (animal)
- Austin Chalk
- Australasian strewnfield
- Australian Shield
- Australite
- Australodocus
- Australopithecus afarensis
- Australosyodon
- Authigenic
- Automated mineralogy
- Autunite
- Avak crater
- Avalanche
- Avalonia
- Avanhandava (meteorite)
- Avebury
- Aveline's Hole
- Avemetatarsalia
- Avenue (archaeology)
- Aviatyrannis
- Avipes
- Avisauridae
- Avisaurus
- Avogadrite
- Avon Park Formation
- Avulsion (river)
- Awaruite
- Awatere Fault
- Axinite
- Axton Fault
- Aymestry Limestone
- Ayusokkanian
- Azendohsaurus
- Azoic Age
- Azores Triple Junction
- Azores hotspot
- Azurite
- B. Clark Burchfiel
- BP Structure
- BS 5930
- Babefphite
- Babingtonite
- Back-arc basin
- Back-stripping
- Backwater (river)
- Baddeleyite
- Badjcinus
- Badlands
- Badlands Guardian
- Baetylus
- Bagaraatan
- Bagua Formation
- Bahariya Formation
- Bahia Series
- Bahram Akasheh
- Baikal Rift Zone
- Bainoceratops
- Bajocian
- Bakerite
- Bakesaurus
- Bakken formation
- Bala - Llanelidan Fault
- Bala Fault
- Bala Series
- Balabansai Formation
- Balabansai Svita
- Balancing rock
- Balanerpeton
- Balangeroite
- Balch Cave
- Balcoracania
- Balcoracania dailyi
- Bald Eagle Formation
- Baldonnel Formation
- Ball clay
- Balle (runemaster)
- Balleny hotspot
- Ballytober Fault
- Balochisaurus
- Baltic Ice Lake
- Baltic Plate
- Baltic Shield
- Baltic amber
- Baltic area runestones
- Baltica
- Baltoeurypterus
- Banda Sea Plate
- Banded iron formation
- Banff Formation
- Bangladesh Agricultural Research Institute
- Bangong suture
- Bangudae Petroglyphs
- Bangweulu Block
- Bank (geography)
- Bank erosion
- Banwell Caves
- Banwell Ochre Caves
- Baotite
- Bar (river morphology)
- Baraboo Range
- Bararite
- Barawertornis
- Barbertonite
- Barbourofelidae
- Barents Basin
- Bargate stone
- Barnack
- Barnenez
- Barre Granite
- Barremian
- Barrerite
- Barringer Slough
- Barstowite
- Bartonian
- Barun Goyot Formation
- Bary Glacier
- Baryte
- Basal sliding
- Basalt
- Basalt fan structure
- Basanite
- Basement (geology)
- Bashful elephant
- Bashkirian
- Basilosauridae
- Basin and Range Province
- Basin and range
- Bastnäsite
- Bath Stone
- Batholith
- Bathonian
- Bathvillite
- Bathygnathus
- Bathymetric chart
- Bathyopsis
- Batoka Formation
- Batrachosauria
- Batrachosuchus
- Baudissin Glacier
- Bauria
- Bauru Group
- Baurutitan
- Bauxite
- Bayan Bologai Formation
- Bayan Shireh Formation
- Bayfield group
- Bayin-Gobi Formation
- Bayldonite
- Bayosaurus
- Beach ridge
- Beacon Supergroup
- Beacon sandstone
- Beaconella
- Beaconites
- Beaghmore
- Bear Cave
- Bear Gulch Limestone
- Bear Valley Strip Mine
- Bearpaw Formation
- Beaufort Group
- Beaufort Series
- Beaverhead crater
- Beaverhill Lake Group
- Becke line test
- Becklespinax
- Becquerelite
- Bed (geology)
- Bed load
- Bed material load
- Beddgelert Fault
- Bedform
- Bediasite
- Bedout
- Bedrock
- Beech Hill Fault
- Beecher's Trilobite Bed
- Beecher's Trilobite type preservation
- Beelemodon
- Beenalaght
- Behemotops
- Beijing Anomaly
- Belantsea
- Belcoo Fault
- Belemnitella
- Beleuta Svita
- Belgian Pool
- Bellacartwrightia
- Bellefonte Formation
- Bellingshausen Plain
- Bellingshausen Plate
- Belloy Formation
- Bellusaurus
- Belly River Group
- Belonochasma
- Belt Supergroup
- Bematherium
- Bembridge Beds
- Bemolanga
- Ben Peach
- Bench (geology)
- Benitoite
- Benjamin Kendall Emerson
- Benmoreite
- Bennettitales
- Bennettites
- Beno Gutenberg
- Benthic boundary layer
- Benton Fault
- Benton Springs Fault
- Bentonite
- Bentorite
- Berach Fault
- Beraunite
- Bergenite
- Bergschrund
- Bering Canyon
- Beringia
- Berkeley Geochronology Center
- Berlinite
- Bermuda hotspot
- Bernard Chouet
- Bernard du Bus de Gisignies
- Bernardodon
- Berriasian
- Berryite
- Berserker Range
- Berthierite
- Bertrandite
- Berw Fault
- Berycopsis
- Beryl
- Beryllonite
- Beryozovskoye deposit
- Besa River Formation
- Betafite
- Betasuchus
- Bethel Fault
- Bettws Fault
- Beudantite
- Beyenchime-Salaatin crater
- Biehlite
- Bienosaurus
- Big Cave
- Big Clifty Sandstone
- Big Dan Mine
- Big Snowy Group
- Big Tom, Bronx
- Bigach crater
- Bighorn Basin
- Bihariosaurus
- Bilinite
- Billabong
- Billietite
- Billman Creek Formation
- Bimodal volcanism
- Binghamite
- Biochron
- Bioclast
- Bioerosion
- Biogeochemical cycle
- Biogeochemistry
- Biogeology
- Biogeomorphology
- Biogeophysics
- Biolith
- Biorhexistasy
- Biostratigraphy
- Biotite
- Biozone
- Birbalomys
- Bird River greenstone belt
- Birdsong Sandstone
- Birefringence
- Birgeria
- Birkenia
- Birkrigg stone circle
- Birnessite
- Bisbee Blue
- Biscayne Aquifer
- Bishop's Frome Limestone
- Bishop Tuff
- Bismutite
- Bison antiquus
- Bisonalveus
- Bissekty Formation
- Bissett Formation
- Bisti/De-Na-Zin Wilderness
- Bitectiporidae
- Bituminous coal
- Bituminous shale
- Bixbyite
- Björketorp Runestone
- Björn Kurtén
- Black Creek Formation
- Black Lakes of Jumbura
- Black Peaks Formation
- Black River Escarpment (Wisconsin)
- Black Stone
- Black metal (mineralogy)
- Black smoker
- Blackdamp
- Blackrock (geology)
- Blaenavon Fault
- Blaenhirwaun Thrust
- Blake River Megacaldera Complex
- Blanco Fracture Zone
- Blapsium
- Bleb (mineralogy)
- Blesa Formation
- Blikanasauridae
- Blikanasaurus
- Blisworth Limestone
- Blood Falls
- Bloomsburg Formation
- Blowing Stone
- Blue Lias
- Blue ground
- Blue hole
- Blueschist
- Bluesky Formation
- Bluestone
- Bluff Dale Sandstone
- Blufftown Formation
- Blythe Intaglios
- Bodafon Thrust
- Bodelwyddan Fault
- Bodhi stones
- Body wave magnitude
- Boehmite
- Boesmansgat
- Bogen Glacier
- Bohdašín Formation
- Bohonagh
- Bolca
- Boleite
- Boltwoodite
- Boltysh crater
- Boluochia
- Bonaccordite
- Bonatitan
- Boninite
- Bonnet Plume Formation
- Bonneville Flood
- Book Cliffs
- Boonton Formation
- Boracite
- Borate minerals
- Borden Formation
- Boreal Sea
- Borealosaurus
- Boreaspis
- Boreotropical flora
- Borhyaena
- Borhyaenidae
- Boring (earth)
- Borissiakia
- Bornes Massif
- Bornhardt
- Bornite
- Borogovia
- Borra Caves
- Borrowdale Volcanic Group
- Borup Fiord Pass
- Boso Triple Junction
- Bostobe Svita
- Boston Mountains
- Bostonite
- Botallackite
- Botetourt Springs, Virginia
- Bothriodon
- Bothriogenys
- Bothriospondylus
- Bottleneck Peak and Moon
- Boucle du Baoulé National Park
- Boudinage
- Bouguer anomaly
- Boulangerite
- Boulder
- Boulder Batholith
- Bouldnor Formation
- Bouma sequence
- Bournonite
- Boussingaultite
- Bouvet Triple Junction
- Bovedy (meteorite)
- Bowen's reaction series
- Bowie hotspot
- Bowieite
- Box Canyon, Colorado
- Box Fault
- Boxhole crater
- Brachalletes
- Brachycrus
- Brachydiastematherium
- Brachyopidae
- Brachypodosaurus
- Brackish marsh
- Bradgatia
- Bradyseism
- Braggite
- Brallier Formation
- Bramatherium
- Brammallite
- Branner Earth Sciences Library
- Brassfield Formation
- Bratschen
- Braunite
- Breccia
- Breccia pipe
- Brent crater
- Breviceratops
- Breviparopus
- Briançonnais zone
- Briartite
- Bridge River Ash
- Bridge River Ocean
- Bridge of the Gods (land bridge)
- Bright spot
- Brightseat Formation
- Bristol Channel Fault Zone
- Bristol Diamonds
- Brithopus
- British Geological Survey
- British Tertiary Volcanic Province
- Brito-Arctic province
- Brittle-ductile transition zone
- Britton Formation
- Broadford Beds Formation
- Broby bro Runestones
- Brochantite
- Brockram
- Brodavis
- Brohisaurus
- Broken Hill ore deposit
- Bromargyrite
- Bromide Formation
- Bronnant Fault
- Bronnant Fault Zone
- Bronson Hill Island Arc
- Brontops
- Brontoraptor
- Brontotherium
- Bronzite
- Broome Sandstone
- Brothers Fault
- Brothers Fault Zone
- Brothers volcano
- Brown Glacier
- Brownleeite
- Brownshill Dolmen
- Broxton Rocks
- Bruce C. Heezen
- Bruce Erickson
- Brunhes–Matuyama reversal
- Brunonia Glacier
- Brush Mountain (Blair County, Pennsylvania)
- Brushy Butte
- Brwynd Overthrust
- Bryce Canyon National Park
- Bryn-y-maen Fault
- Bryn Eglwys Fault
- Bryn Morgan Thrust
- Bryn Posteg Fault
- Brynderi Fault
- Bryneglwys Fault
- Bryngwili Fault
- Bryngwyn Fault
- Brøgger Glacier
- Brú na Bóinne
- Budden Canyon Formation
- Buddingtonite
- Bugle Rock
- Bukovite
- Bukovskyite
- Bulger Geyser
- Bull Lake glaciation
- Bulletin of the American Meteorological Society
- Bullhead Group
- Bullockornis
- Bumbanian
- Bundaberg Hummock
- Bungil Formation
- Bunter (geology)
- Buntsandstein
- Burckle Crater
- Burdigalian
- Burgess Shale
- Burgess Shale type fauna
- Burgess Shale type preservation
- Burgoon Formation
- Burgstein (Thuringia)
- Burgsvik beds
- Burma Plate
- Burn O'Vat
- Burnetiidae
- Bush Moa
- Bushveld Igneous Complex
- Bushveld Sandstone Formation
- Buxton Glacier
- Bwlchgwyn Fault
- Byblos Fossil Museum
- Bylchau Fault
- Bystrite
- Bytownite
- Caballo Mountains
- Cabonnichthys
- Cache Creek Terrane
- Cacholong
- Cacops
- Cacoxenite
- Cactolith
- Cadmoindite
- Cadmoselite
- Cadomian Orogeny
- Cadomin Formation
- Cae Parc Fault
- Caenagnathasia
- Caerdeon Bodlyn Fault
- Caergwrle Fault
- Caerleon Fault
- Caerphilly Fault
- Cahnite
- Cainotherium
- Caithness Flagstone Group
- Calabozos
- Calabrian (stage)
- Calamitaceae
- Calamites
- Calamospondylus
- Calaveras Fault
- Calaverite
- Calc-alkaline magma series
- Calcaire de Caen
- Calcaire de Valognes
- Calcaire à Spatangues
- Calcare di Aurisina
- Calcarenite
- Calcareous
- Calcarintes du Jadet Formation
- Calceolispongia
- Calcflinta
- Calcimicrobe
- Calcite
- Calcite sea
- Calcium aluminates
- Calcium carbonate
- Caldera
- Calderite
- Caledonian orogeny
- Caliche
- California Earthquake Prediction Evaluation Council
- Calizus de Lychnus Formation
- Callovian
- Callovosaurus
- Calumetite
- Calvin crater
- Calymene niagarensis
- Calymmian
- Calypso Deep
- Camadas de Montejunto
- Camarillas Formation
- Camas Formation
- Cambrian
- Cambrian explosion
- Cambrian substrate revolution
- Cambrian–Ordovician extinction event
- Camdwr Fault
- Camelops
- Camelotia
- Cameron's Line
- Camlough Fault
- Campanian
- Campanorco
- Campo del Cielo
- Camposaurus
- Campylocephalus
- Campylodoniscus
- Canadaga
- Canadian Geophysical Union
- Canadian Shield
- Canadian Society of Petroleum Geologists
- Canary Islands Quail
- Canary hotspot
- Canavesite
- Cancrinite
- Canfieldite
- Cannel coal
- Canobius
- Canon del Colorado Formation
- Cantabria (Mesozoic island)
- Canyon
- Canyon Diablo (meteorite)
- Cap carbonate
- Cape Fold Belt
- Cape May diamonds
- Cape Sebastian Sandstone
- Capel Garmon Fault
- Capillary fringe
- Capitalsaurus
- Capitanian
- Caprock
- Carancas impact event
- Carbon capture and storage
- Carbon fixation
- Carbon flaw
- Carbon sequestration
- Carbonaceous chondrite
- Carbonaceous film
- Carbonate compensation depth
- Carbonate minerals
- Carboniferous
- Carboniferous Rainforest Collapse
- Carboniferous limestone
- Carcinosoma
- Cardiel Formation
- Cardigan - Fishguard Fault Belt
- Cardigan Pluton
- Cardiocephalus
- Cardium Formation
- Caribbean Plate
- Caribbean large igneous province
- Carl August Stetefeldt
- Carletonite
- Carlile Formation
- Carlin Unconformity
- Carlin–type gold deposit
- Carlsberg Ridge
- Carmel Fault (Carmarthenshire)
- Carmel Fault (Powys)
- Carmel Head Thrust
- Carnallite
- Carnegie (ship)
- Carnegie Ridge
- Carnelian
- Carnian
- Carnlough Fault
- Carnotaurinae
- Carnotite
- Carolina Bay
- Caroline Birley
- Carpathian Flysch Belt
- Carpathite
- Carpinteria Tar Pits
- Carpolestes
- Carpolestes simpsoni
- Carreg Cennen Disturbance
- Carrog Valley Fault
- Carrollite
- Carswell crater
- Cascade Overthrust
- Cascade Volcanoes
- Casea
- Caseasauria
- Caseoides
- Caseopsis
- Caseosaurus
- Casineria
- Casselman Formation
- Cassiar Terrane
- Cassinoceras
- Cassiterite
- Castell Fault
- Castillo Formation
- Castlegate Sandstone
- Cataclasite
- Cataclastic rock
- Catalina Schist
- Catastrophism
- Catenoleimus
- Cathartesaura
- Catopithecus
- Catskill Formation
- Cattierite
- Caturrita Formation
- Cavansite
- Cave
- Cave diving
- Cave of Swallows
- Cave popcorn
- Caves of the Mendip Hills
- Cayambe Coca Ecological Reserve
- Caymanite
- Cedar Mesa Sandstone
- Cedarosaurus
- Cefn-cerig Road
- Cefn Bryn Thrust
- Cefn Crib Fault
- Cefn Fault
- Cefn Garw Fault
- Cefn Ila Fault
- Cefnamwlch-Rhiw Fault
- Ceibwr Bay Fault
- Ceidio Fault
- Celadonite
- Celestine (mineral)
- Celsian
- Cement (geology)
- Cenomanian
- Cenomanian-Turonian boundary event
- Cenozoic
- Cenozoic Research Laboratory
- Center for Meteorite Studies
- Central America Volcanic Arc
- Central American Seaway
- Central Asian Orogenic Belt
- Central Indian Ridge
- Central Lapland Greenstone Belt
- Centralian Superbasin
- Centroberyx
- Centrosaurinae
- Cephalomyidae
- Ceramornis
- Ceratodus tiguidensis
- Cerdocyon avius
- Cerite
- Cerrejón Formation
- Cerro Azul (Chile volcano)
- Cerro Barcino Formation
- Cerro Carnerero Formation
- Cerro Castillo Formation
- Cerro Minchincha
- Cerro del Pueblo Formation
- Cervandonite
- Cesanite
- Cesbronite
- Cetiosauriscus
- Cetopangasius
- Cetotherium
- Ceunant Fault
- Chabazite-Ca
- Chaetocladus
- Chaidamuite
- Chalcanthite
- Chalcedony
- Chalcophyllite
- Chalcopyrite
- Chalk
- Chalk Group
- Chalk stream
- Challenger Deep
- Challenger Glacier
- Challenger Plateau
- Chambersite
- Chamosite
- Chandler Formation
- Chandler wobble
- Changbaiite
- Changchengornis
- Changdusaurus
- Changhsingian
- Channel pattern
- Channel types
- Chaoyangsauridae
- Chapalmalania
- Chapel Fault
- Chapmanite
- Characteristic earthquake
- Charcot Plate
- Chari Formation
- Charles Alfred Matley
- Charles Barrois
- Charles C. Bradley
- Charles Darwin
- Charles David Curtis
- Charles Francis Richter
- Charles Hyde Warren
- Charles Kenneth Leith
- Charles Konig
- Charles Lapworth
- Charles Lory
- Charles Lyell
- Charles Rollin Keyes
- Charles Schuchert
- Charles Upham Shepard
- Charles W. Gilmore
- Charles Whittlesey (geologist)
- Charles William Peach
- Charlevoix Seismic Zone
- Charlevoix crater
- Charlie-Gibbs Fracture Zone
- Charnia
- Charnockite
- Charnockite, St. Thomas Mount
- Charonosaurus
- Chasicoan
- Chasmaporthetes
- Chassigny (meteorite)
- Chatham Penguin
- Chatter mark
- Chattian
- Chattooga River
- Chazy Formation
- Chebsaurus
- Cheiracanthus
- Cheirolepis
- Cheirothrix
- Chelydrops
- Chemical oceanography
- Chemositia
- Chemostratigraphy
- Chenini Formation
- Chepstow Fault
- Chergach
- Chernobylite
- Chert
- Chesapeake Bay impact crater
- Cheshire Basin
- Chester A. Arnold
- Chesterite
- Chestnut Ridge, Bedford County
- Chevron (geology)
- Chevron (land form)
- Cheyenne belt
- Chiastolite
- Chichali Formation
- Chickies Formation
- Chickies Ridge
- Chico Formation
- Chicxulub crater
- Chiemgau impact hypothesis
- Chilantaisaurus
- Chilcotin Group
- Childrenite
- Chile Rise
- Chile Triple Junction
- Chilecebus
- Chilgog Formation
- Chilhowee formation
- Chilotherium
- Chimera (paleontology)
- China Geological Survey
- China stone
- Chinati Mountains
- Chindesaurus
- Chine
- Chinese jade
- Chiniquodontoidea
- Chinle Formation
- Chinlea
- Chinshakiangosaurus
- Chipola Formation
- Chitarwata Formation
- Chitinozoan
- Chiyli crater
- Chlorargyrite
- Chlorastrolite
- Chloritoid
- Chondrite
- Chondritic unfractionated reservoir
- Chondrodite
- Chondroplon
- Chondrosteosaurus
- Chonetes
- Chonolith
- Chorillo Formation
- Chriacus
- Chrisstanleyite
- Christensen Glacier (South Georgia)
- Christian Koeberl
- Christian Leopold von Buch
- Christite
- Christmas Island Seamount Province
- Christoph Gottfried Andreas Giebel
- Christopher Hansteen
- Christopher Packe (physician and cartographer)
- Christopher Scotese
- Christophersen Glacier
- Chromite
- Chromitite
- Chroniosaurus
- Chroniosuchus
- Chronostratigraphy
- Chronozone
- Chrysoberyl
- Chrysocolla
- Chrysoprase
- Chrysotile
- Chuandongocoelurus
- Chuanjie Formation
- Chuanjiesaurus
- Chubutherium
- Chubutisaurus
- Chuckanut Formation
- Chugwater Formation
- Chukcha crater
- Chukchi Sea Shelf
- Chungkingosaurus
- Churchill craton
- Cilfeigan Fault
- Cimarron Ridge Formation
- Cimmeria (continent)
- Cimmerian Orogeny
- Cimmerian Plate
- Cimolesta
- Cimolestes
- Cimolichthys
- Cimolopteryx
- Cinder
- Cinder cone
- Cinizasaurus
- Cinnabar
- Cionodon
- Circum-Superior Belt
- Cirque glacier
- Cistecephalus
- Cistecephalus Assemblage Zone
- Cisuralian
- Clade
- Cladoselache
- Cladosictis
- Claerwen Fault
- Claggett Shale
- Clarence Fault
- Clarence Moreton Basin
- Clark Quarry
- Clarkeite
- Clarkia fossil beds
- Clasmodosaurus
- Classification of minerals – Non silicates
- Classification of minerals – Silicates
- Clastic dike
- Clastic rock
- Clastic wedge
- Clausthalite
- Clavilithes
- Clay
- Clay earth pigment
- Clay minerals
- Claypan
- Clayton-Marsh Creek-Greenville Fault
- Clayton Glacier
- Clearwater Formation
- Clearwater Lakes
- Cleavage (geology)
- Clement Reid
- Clepsydrops
- Cleveite
- Cliff
- Cliff-former
- Cliff-top dune
- Climacoceras
- Climacoceratidae
- Climactichnites
- Climate change
- Climate change and poverty
- Climate change feedback
- Climatiiformes
- Climatius
- Clinohumite
- Clinoptilolite
- Clinopyroxene thermobarometry
- Clinozoisite
- Clinton Group
- Clintonite
- Clive Forster Cooper
- Clogher Valley Fault
- Closure temperature
- Cloud Creek crater
- Cloudinid
- Cloverly Formation
- Club (anatomy)
- Clutch (eggs)
- Clwyd Fault
- Clydach Bridge Fault
- Clywedog Fault
- Coal
- Coal ball
- Coal forest
- Coal measures
- Coalbrook Fault
- Coast Range Arc
- Coast Range Geomorphic Province
- Coastal Volcanic Belt
- Cobaltite
- Cobb hotspot
- Cobble (geology)
- Cobelodus
- Cobequid fault
- Coccinite
- Coccolithophore
- Coccosteus
- Cochleosaurus
- Cockercombe tuff
- Coconinoite
- Cocos Plate
- Codball
- Cody Scarp
- Cody Shale
- Coed-y-paen Fault
- Coed Hir Fault
- Coed Ithel Fault
- Coelophysidae
- Coelopleurus
- Coeluridae
- Coeluroides
- Coesite
- Coffinite
- Cohenite
- Cokedale Formation
- Colalura Sandstone
- Cold seep
- Coldwell Complex
- Colepiocephale
- Colhuehuapian
- Coli Toro Formation
- Collision zone
- Colluvium filled bedrock hollow
- Coloradisaurus
- Colorado Group
- Colorado orogeny
- Coltan
- Columbia (supercontinent)
- Columbite
- Columbus Limestone
- Comanchesaurus
- Comley limestone
- Common surface features of Mars
- Compaction (geology)
- Compatibility (geochemistry)
- Competence (geology)
- Complex crater
- Complex volcano
- Compression (geology)
- Compression fossil
- Compsosuchus
- Compton Glacier
- Compton Martin Ochre Mine
- Conasauga shale
- Conchoraptor
- Concretion
- Condorraptor
- Condurrite
- Cone-in-cone structures
- Conglomerados de Caranguejeira
- Conglomerate (geology)
- Congo craton
- Congorhynchus
- Coniacian
- Conichalcite
- Coniornis
- Coniston Limestone
- Connecticut River Valley trackways
- Connolly Basin crater
- Conococheague Formation
- Conoscopic interference pattern
- Conoscopy
- Conrad discontinuity
- Continent
- Continent-ocean boundary
- Continental Ranges
- Continental collision
- Continental crust
- Continental drift
- Continental fragment
- Continental rise
- Continental shelf
- Contourite
- Conulariids
- Conulus
- Convergent boundary
- Convergent evolution
- Conway Formation
- Conway granite
- Cooksonia
- Cool early Earth
- Cool tropics paradox
- Coon Creek Formation
- Cooper Canyon Formation
- Cooperite
- Coordinating Committee for Earthquake Prediction
- Coosawhatchie Formation
- Cooyoo
- Copaline
- Cope's rule
- Copepteryx
- Copernican period
- Copiapite
- Copper Works Fault
- Copper mining in the United States
- Coppermine River Group
- Coquina
- Corallian Limestone
- Corallian Oolite Formation
- Coralline rock
- Cordierite
- Cordillera
- Cordillera Occidental
- Cordilleran Ice Sheet
- Core sample
- Coreena Formation
- Core–mantle boundary
- Corkite
- Cornbrash
- Cornbrash Formation
- Cornuata
- Cornubian batholith
- Corral de Enmedio Formation
- Corrasion
- Correlation of Stratigraphic Units of North America
- Cors-bol Fault
- Corton Formation
- Corundum
- Corycian Cave
- Coryphodon
- Cosmogenic radionuclide dating
- Coso Hot Springs
- Cosoryx
- Costean
- Cotswold Slate
- Cotswold stone
- Cotta Sandstone
- Coulee
- Couloir
- Country rock (geology)
- Coupatezia
- Couture crater
- Cox's Cave
- Coyoteite
- Crack in the Ground
- Crag and tail
- Craie Chloritee
- Craie tufau
- Craig-y-beri Fault
- Craig-y-glyn Fault
- Craig Twrch Fault
- Craignant - Milton Fault
- Craignant Fault
- Cramauchenia
- Cranioceras
- Craspedodon
- Crater Glacier
- Crater Lake
- Craterosaurus
- Craton
- Cratonic sequence
- Crawford crater
- Creation–evolution controversy
- Creedite
- Creigydd Fault
- Crenaticaulis
- Crenulation
- Crest (hydrology)
- Cretaceous
- Cretaceous Long Normal
- Cretaceous Mongolia
- Cretaceous Thermal Maximum
- Cretaceous–Paleogene extinction event
- Cretan Dwarf Megacerine
- Cretoperipatus burmiticus
- Cretoxyrhinidae
- Crevasse Canyon Formation
- Cribarth Disturbance
- Crichtonsaurus
- Crick Fault
- Cristatusaurus
- Critical taper
- Cro-Magnon 1
- Crocoite
- Cromer Forest Bed
- Cromer Ridge
- Cronstedtite
- Crooked Creek crater
- Crookesite
- Cross-bedding
- Cross-cutting relationships
- Cross-plot
- Cross Ash Fault
- Crossite
- Crowfoot Formation
- Crowsnest Formation
- Crusafontia
- Crushed stone
- Crust (geology)
- Crustal recycling
- Cruziana
- Crychan Fault
- Crychan Fault Belt
- Cryogenian
- Cryolite
- Cryptic era
- Cryptocrystalline
- Cryptodome
- Cryptoexplosion
- Cryptoraptor
- Cryptosaurus
- Crystal Cave (Ohio)
- Crystal Cave (Pennsylvania)
- Crystal cluster
- Crystal habit
- Crystal system
- Crystallography
- Csehbánya Formation
- Ctenaspis
- Ctenopristis
- Ctenopterus
- Ctenorhabdotus
- Ctenorhachis
- Ctenospondylus
- Ctenurella
- Cubanite
- Cuesta
- Cueva del Fantasma
- Cueva del Viento
- Culm Measures
- Cumberland Plateau
- Cumberlandite
- Cummingtonite
- Cumulate rock
- Cupalite
- Cupressocrinites
- Cuprosklodowskite
- Cuprospinel
- Curite
- Current sea level rise
- Cuspate foreland
- Cuspirostrisornis
- Cut bank
- Cutinite
- Cuvieronius
- Cwm-Mawr Fault
- Cwm-dows Fault
- Cwm Cayo Brook Fault
- Cwm Cynnen Fault
- Cwm Dockin Fault
- Cwm Dwfnant Fault
- Cwm Earl Fault
- Cwm Felin Fault
- Cwm Llwyd Fault
- Cwm Pennant Fault
- Cwm Pit Fault
- Cwm Sylwi Fault
- Cwmcarvan Fault
- Cwmgwineu Fault
- Cwmllynfell Fault
- Cwmmawr Thrust
- Cwmneol Fault
- Cyanotrichite
- Cyathocrinites
- Cycladic Massif
- Cycle of erosion
- Cyclic salt
- Cyclic sediments
- Cyclomedusa
- Cyclostratigraphy
- Cyclothems
- Cyclothyris
- Cyclotosaurus
- Cygnus falconeri
- Cylindrite
- Cylindroteuthis
- Cymmer Fault
- Cymrite
- Cynarctus
- Cynheidre Thrust
- Cynllaith Fault
- Cynodesmus
- Cynodictis
- Cynognathus Assemblage Zone
- Cyonasua
- Cypress Hills Formation
- Cyprus arc
- Cyranichthys
- Cyrilovite
- D"
- Daanosaurus
- Dabrazinskaya Svita
- Dachongosaurus
- Dacite
- Daedalus (trace fossil)
- Daeodon
- Dahkla Formation
- Dai Hung oilfield
- Dakota Sandstone
- Dakotadon
- Dalangshan Formation
- Dale Russell
- Dalgaranga crater
- Dalianraptor
- Dallasite
- Dalpiazia
- Dalradian
- Damalasaurus
- Damp (mining)
- Dan McKenzie (geophysicist)
- Danburite
- Dandakosaurus
- Danian
- Daniel Barringer (geologist)
- Daniel Sigman
- Daohugou Beds
- Daphne Island
- Daphoenus
- Dapingfangornis
- Dapuka Group
- Daril Formation
- Darriwilian
- Dartmoor kistvaens
- Dartmuthia
- Darwin Crater
- Darwin Island
- Darwin Rise
- Darwin glass
- Dashanpusaurus
- Dashuigou Formation
- Dasypus bellus
- Davelis Cave
- David A. Johnston
- David B. Norman
- David Dale Owen
- David Forbes (mineralogist)
- David P. Penhallow
- David Williams (geologist)
- Davidite
- Daye Group
- Deacock Glacier
- Dead-ice
- Dead Clade Walking
- Dead End Glacier
- Dead Sea Rift
- Deadwater (topography)
- Debolt Formation
- Debris flow
- Decaturville crater
- Decorah Shale
- Deep-ocean Assessment and Reporting of Tsunamis
- Deep Bay crater
- Deep Sea Drilling Program
- Deep focus earthquake
- Deep time
- Deep well drilling
- Deformation mechanism
- Degradation (geology)
- Deinogalerix
- Delamination (geology)
- Delaware Geological Survey
- Delaware Water Gap
- Delhi, Qinghai
- Delitzschala
- Dellen
- Dells of the Wisconsin River
- Delphyodontos
- Delta switching
- Deltadromeus
- Deltatheridium
- Deltoblastus
- Deltoptychius
- Delvauxite
- Demantoid
- Demesmaekerite
- Demoiselles Coiffées de Pontis
- Demopolis Chalk Formation
- Denali Fault
- Denderpeton
- Dendrerpeton
- Dendrochronology
- Dense non-aqueous phase liquid
- Densus Ciula Formation
- Dents de Lanfon
- Denver Basin
- Deposition (geology)
- Depression (geology)
- Depth conversion
- Depth hoar
- Depth–slope product
- Dercetis
- Dercetoides
- Derived fossil
- Derriksite
- Des Plaines crater
- Deseadan
- Desert
- Desert pavement
- Desmatophoca
- Desmostylus
- Detachment fault
- Detritus (geology)
- Detroit Seamount
- Deutsches Geodätisches Forschungsinstitut
- Devil's Backbone (rock formation)
- Devil's Jumps, Churt
- Devil's Rock
- Devilline
- Devils Hole
- Devonian
- Dharwar craton
- Diabasbrottet quarry
- Diabase
- Diabolepis
- Diacalymene
- Diachronous
- Diacodexis
- Diadiaphorus
- Diadochite
- Diagenesis
- Diamictite
- Diamicton
- Diapir
- Diarthrognathus
- Diastrophism
- Diatom
- Diatomaceous earth
- Diatreme
- Dicellopyge
- Dichobunidae
- Dickinsoniidae
- Diclonius
- Dicoelosia
- Dicranurus
- Dicrocerus
- Dictyothyris
- Dicynodon Assemblage Zone
- Didazoonidae
- Didolodus
- Differential stress
- Digenite
- Digital geologic mapping
- Digital outcrop models
- Dike (geology)
- Dike swarm
- Diluvium
- Dim spot
- Dimerocrinites
- Dimylus
- Dinaelurus
- Dinantian
- Dinictis
- Dinocaridida
- Dinocochlea
- Dinodocus
- Dinofelis
- Dinogorgon
- Dinohippus
- Dinosaur Isle
- Dinosaur Park (Prince George's County, Maryland)
- Dinosaur Park Formation
- Dinosaur Ridge
- Diogenite
- Diogenornis
- Dioptase
- Diorite
- Dip circle
- Diplichnites
- Diplocaulidae
- Diplocaulus
- Diploceraspis
- Diplocraterion
- Diplotomodon
- Diplovertebron
- Dipnorhynchus
- Dipterus
- Dirt cone
- Discharge (hydrology)
- Discinisca
- Discontinuity (geotechnical engineering)
- Discosauriscidae
- Discosauriscus
- Discrete element method
- Dissacus
- Dissected plateau
- Dissolved load
- Dissopsalis
- Distributary
- Disturbance (geology)
- Divergent boundary
- Djadochta Formation
- Doahuqou Formation
- Doane Rock
- Dob's Linn
- Dobele crater
- Dockum Group
- Docodon
- Docodonta
- Doedicurus
- Doggerland
- Dohoin Usa Formation
- Doig Formation
- Doleorthis
- Dolerite
- Dolichocebus
- Dolichosuchus
- Dolichuranus
- Doliosauriscus
- Dollaseite-(Ce)
- Dolomite
- Dolomitization
- Dolores River Canyon
- Dolostone
- Dome (geology)
- Domeykosaurus
- Don L. Anderson
- Don Lessem
- Donald Canfield
- Dongbeititan
- Donnybrook stone
- Donoho Creek Formation
- Doryaspis
- Double terminated crystal
- Doublet earthquake
- Douglas Emlong
- Douglas Erwin
- Douiret Formation
- Doushantuo Formation
- Downes Glacier
- Draconyx
- Drainage basin
- Drainage divide
- Drefach Group
- Dreikanter
- Drepanaspis gemuendenensis
- Drepanopterus
- Dresbachian
- Drift (geology)
- Drift mining
- Driftless Area
- Drimys (fish)
- Dromaeosauroides
- Dromasauria
- Dromiceiomimus
- Dromornis australis
- Dromornis stirtoni
- Dropstone
- Drummer (soil)
- Drummond Matthews
- Druse (geology)
- Dry quicksand
- Dryptosauridae
- Dryptosauroides
- Dryrock
- Drysdallite
- Dubreuillosaurus
- Ductility (Earth science)
- Duftite
- Dukamaje Formation
- Duluth Complex
- Dundasite
- Dune
- Dunham classification
- Dunite
- Dunkard Group
- Dunvegan Formation
- Dunyazad (crater)
- Duria Antiquior
- Duricrust
- Dutch Creek Hoodoos
- Duvernay Formation
- Dvinosauria
- Dwyka
- Dwyka Group
- Dynamic quartz recrystallization
- Dynamic topography
- Dyoplosaurus
- Dyscrasite
- Dysganus
- Dyslocosaurus
- Dystrophaeus
- Dzhalindite
- Décollement
- ECLIPSE (reservoir simulator)
- ETH Laboratory of Ion Beam Physics
- Eagle Butte crater
- Eagle Ford Formation
- Eagle Sandstone
- Ealey Glacier
- Early Cambrian
- Early Cambrian geochemical fluctuations
- Early Cretaceous
- Early Devonian
- Early Earth
- Early Imbrian
- Early Jurassic
- Early Mississippian
- Early Ordovician
- Early Pennsylvanian
- Early Pleistocene
- Early Triassic
- Earth
- Earth's magnetic field
- Earth's orbit
- Earth's rotation
- Earth's spheres
- Earth Impact Database
- Earth Interactions
- Earth Surface Processes and Landforms
- Earth mass
- Earth materials
- Earth physical characteristics tables
- Earth science
- Earth tide
- Earthflow
- Earthquake
- Earthquake swarm
- Earthquake warning system
- Earthquakes in Japan
- Earthscope
- East African Rift
- East Antarctic craton
- East Australia hotspot
- East European craton
- East Pacific Rise
- Eastend Formation
- Easter Plate
- Easter hotspot
- Eastern Mediterranean event
- Eastern North America Rift Basins
- Eastwater Cavern
- Ecca Group
- Echinocorys
- Echinodon
- Echinognathus
- Eclipse Glacier
- Eclogite
- Economic geology
- Ectasian
- Ecteninion
- Ectocion
- Ectoconus
- Edaphosauridae
- Eday Group
- Edenite
- Edestus
- Ediacara biota
- Ediacaran
- Ediacaria
- Edinburgh Geological Society
- Edmond Halley
- Edmonton Group
- Edops
- Edough massif
- Eduction (geology)
- Edward A. Irving
- Edward Budge
- Edward Howel Francis
- Edward W. Berry
- Edwin Harris Colbert
- Eemian
- Eemian sea
- Effusive eruption
- Efraasia
- Efremovite
- Eginsai Svita
- Eh (geology)
- Eifel hotspot
- Eifelian
- Eilat stone
- Ejinhoro Formation
- Ekaltadeta
- Ekanite
- Ekrixinatosaurus
- El Collado Formation
- El Picacho Formation
- El Tranquilo Formation
- Elagh Fault
- Elaphrosaurus
- Elbe Sandstone
- Elbogen (meteorite)
- Elbow crater
- Eldorado Valley
- Electrical resistance survey (archaeology)
- Electrical resistivity tomography
- Electrode array
- Elephas namadicus
- Elephas recki
- Elgygytgyn Lake
- Elizabeth Carne
- Elk Basin
- Elk Point Group
- Elkanah Billings
- Ellerslie Member
- Ellesmere Island Volcanics
- Elliot Formation
- Ellis Group
- Elm Coulee Oil Field
- Elmer S. Riggs
- Elmisaurus
- Elomeryx
- Elsinore Fault Zone
- Elso Sterrenberg Barghoorn
- Elsornis
- Eluvium
- Elvan
- Emanuel Bunzel
- Emausaurus
- Embasaurus
- Embolomeri
- Embrithopoda
- Emeishan Traps
- Emerald
- Emery (mineral)
- Emil Wiechert
- Emirian
- Emmonsite
- Empressite
- Emsian
- Emydops
- En echelon veins
- Enaliarctos
- Enaliarctos emlongi
- Enaliornis
- Enantiornis
- Enchodus
- Encisco Group
- End-Botomian mass extinction
- End-Ediacaran extinction
- Enderbite
- Endocranial cast
- Endorheic basin
- Endothiodon
- Engineering geology
- Enhanced geothermal system
- Enhydrocyon
- Enigmosaurus
- Enon Formation
- Enrichment factor
- Enriquillo–Plantain Garden fault zone
- Ensenadan
- Ensisheim (meteorite)
- Enstatite
- Enstatite chondrite
- Entrenched river
- Environmental and Engineering Geophysical Society
- Environmental geology
- Environmental magnetism
- Eoalulavis
- Eoarchean
- Eobasileus
- Eobothus
- Eobrontosaurus
- Eocaecilia
- Eocarcharia
- Eocardia
- Eocathayornis
- Eocene
- Eocene–Oligocene extinction event
- Eoconfuciusornis
- Eocrinoid
- Eodicynodon
- Eodicynodon Assemblage Zone
- Eoenantiornis
- Eogyrinidae
- Eogyrinus
- Eolambia
- Eolith
- Eomanis
- Eomoropidae
- Eomys
- Eon (geology)
- Eonothem
- Eophyllophyton
- Eos (journal)
- Eospirifer
- Eotebenna
- Eotheroides
- Eothyris
- Eotitanops
- Eozoon canadense
- Eozostrodon
- Epachthosaurus
- Epanterias
- Eparchaean Unconformity
- Epeiric sea
- Epeirogenic movement
- Epicenter
- Epidosite
- Epidote
- Episodes (journal)
- Epoccipital
- Eporeodon
- Equatorial ridge
- Era (geology)
- Erathem
- Eratosthenian
- Eremotherium
- Erettopterus
- Ergilian
- Erich Maren Schlaikjer
- Ericiolacerta
- Ericssonite
- Eridanos (geology)
- Erik Jarvik
- Eriptychiida
- Erliansaurus
- Erlikosaurus
- Erling Dorf
- Ernanodon
- Ernietta
- Eromanga Basin
- Erosion
- Erosion and tectonics
- Erquitaia
- Eruption column
- Erwin Hinckly Barbour
- Erygmascope
- Eryon
- Eryosuchus
- Erythrite
- Erythrotherium
- Es Skhul
- Escarpment
- Escarpment Grit
- Escucha Formation
- Eshanosaurus
- Esker
- Esperite
- Essonodon
- Estavelle
- Estuary
- Ettringite
- Eucercosaurus
- Euchambersia
- Euchroite
- Eucladoceros
- Euclase
- Eucrite
- Eudialyte
- Eudialyte group
- Euenantiornithes
- Euhelopodidae
- Euhelopus
- Eumegamys
- Eumeralla Formation
- Eumorphocorystes
- Euphoberia
- Euramerica
- Eurasian Plate
- Eurhinodelphinidae
- Eurhinodelphis
- Eurolimnornis
- Euronychodon
- European Cenozoic Rift System
- European Geosciences Union
- Eurotamandua
- Eurotrochilus
- Euryapteryx
- Eurypholis
- Eurypterus remipes
- Euryzygoma
- Euskelosaurus
- Eusmilus
- Eutaw Formation
- Eutherocephalia
- Euxine abyssal plain
- Evanston Formation
- Evaporite
- Eveite
- Everglades
- Evermanella
- Evgeny Maleev
- Evolution of dinosaurs
- Evolution of fungi
- Evolutionary history of plants
- Evolutionary radiation
- Ewing Seamount
- Exaeretodon
- Exfoliation joint
- Exhumed river channel
- Exner equation
- Exocoetoides
- Exotic terrane
- Expansive clay
- Exploration geophysics
- Explorer Plate
- Explorer Ridge
- Explorornis
- Exshaw Formation
- Extensional fault
- Extensional tectonics
- Extinct volcano
- Extinction angle
- Extinction event
- Extraterrestrial materials
- Extrusive
- FEFLOW
- Fabric (geology)
- Fabrosauridae
- Fabrosaurus
- Facies
- Fahlband
- Fairy Cave Quarry
- Falcatus falcatus
- Fall River granite
- Fall line
- Famennian
- Farak Formation
- Farallon Plate
- Farallon Trench
- Farewell Rock
- Fasciculus
- Fassaite
- Fault-block
- Fault (geology)
- Fault block
- Fault breccia
- Fault gouge
- Fault scarp
- Fault trace
- Favret Formation
- Fayalite
- February 4, 1998 Afghanistan earthquake
- Fech fech
- Feldspar
- Feldspathoid
- Felix Andries Vening Meinesz
- Felsenmeer
- Felsic
- Feltville Formation
- Fen Complex, Norway
- Fengjiahe Formation
- Ferberite
- Ferdinand Stoliczka
- Ferdinand Zirkel
- Ferganasaurus
- Ferganocephale
- Fergusonite
- Fern spike
- Fernie Formation
- Feroxyhyte
- Ferrallitisation
- Ferrihydrite
- Ferropericlase
- Ferroselite
- Festningen Geotope Protected Area
- Fettelite
- Feuerletten Formation
- Fezouata formation
- Fiamme
- Fichtelgebirge
- Ficopsis
- Fifth planet (hypothetical)
- Fiftyone Glacier
- Figure of the Earth
- Firedamp
- First appearance datum
- First break picking
- Fish Canyon tuff
- Fisk Holbrook Day
- Fissility (geology)
- Fission track dating
- Fjord
- Fjords of the United States
- Flame structure
- Flaming Cliffs
- Flandrian interglacial
- Flaser bed
- Flashline Mars Arctic Research Station
- Flat-slab subduction
- Flat spot (reflection seismology)
- Flatwood
- Flaxman crater
- Fleming Fjord Formation
- Flin Flon greenstone belt
- Flint
- Flood basalt
- Flood geology
- Florence Bascom
- Florentino Ameghino
- Florida Caverns State Park
- Floridan Aquifer
- Flow banding
- Flowstone
- Fluckite
- Fluid inclusions
- Fluoborite
- Fluocerite
- Fluor-liddicoatite
- Fluor-uvite
- Fluorcaphite
- Fluorite
- Fluororichterite
- Fluting (geology)
- Fluvial
- Fluvial landforms of streams
- Flynn Creek crater
- Flysch
- Fodinichnia
- Foelsche crater
- Foiba
- Foidolite
- Fold (geology)
- Fold and thrust belt
- Fold mountain
- Foliation (geology)
- Folk classification
- Foraminiferal Colouration Index
- Forcall Formation
- Forearc
- Forebulge
- Foreknobs Formation
- Foreland basin
- Forensic geology
- Forensic seismology
- Foreset bed
- Foreshock
- Forest Sandstone Formation
- Forfexicaris
- Form classification
- Formation (stratigraphy)
- Forsterite
- Fort Crittenden Formation
- Fort Payne Formation
- Fort Simpson Formation
- Fort St. John Group
- Fort Union Formation
- Fossa (geology)
- Fossil
- Fossil Detectives
- Fossil Parks of India
- Fossil collecting code
- Fossil fuel
- Fossil trackway
- Fossil water
- Fossils of the Burgess Shale
- Fougerite
- Fountain Formation
- Fountain Paint Pot
- Fox Hills Formation
- Fractional crystallization (geology)
- Fracture (geology)
- Fracture zone
- Fraipontite
- Fram Formation
- Francevillite
- Francis Arthur Bather
- Francis Birch (geophysicist)
- Francis J. Pettijohn
- Franciscan Assemblage
- Franckeite
- Frankamenite
- Frankdicksonite
- Franklinite
- Franz Ritter von Hauer
- Franz Xaver Zippe
- Fraser Filter
- Frasnian
- Frederick Augustus Genth
- Frederick C. Finkle
- Frederick Drew
- Frederick Haynes Newell
- Frederick Schram
- Frederick Vine
- Free-air gravity anomaly
- Freibergite
- Freieslebenite
- Fremouw Formation
- Frenchman Formation
- Freshwater marsh
- Friedrich Johann Karl Becke
- Friedrich von Huene
- Frontenac Axis
- Frontier Formation
- Froschfelsen
- Frost creep
- Frost line
- Frostwork
- Fruchtschiefer
- Fruitland Formation
- Fröjel formation
- Fubarite
- Fucauma Diamond Mine
- Fuente de los Azulejos
- Fukuchilite
- Fukuiraptor
- Fukuisaurus
- Fulengia
- Fulgurotherium
- Fumarole
- Furong Cave
- Furongian
- Fusakichi Omori
- Fusuisaurus
- Futaba Group
- Future of the Earth
- G. K. Warren Prize
- GB Cave
- Gabbro
- Gabrielite
- Gadolinite
- Gahnite
- Gakkel Ridge
- Galapagos Microplate
- Galapagos Rise
- Galapagos Triple Junction
- Galaxite
- Galechirus
- Galena Group
- Galesauridae
- Galesaurus
- Galilee (ship)
- Galkhaite
- Gallinuloides
- Galmoy Mine
- Galápagos hotspot
- Gananite
- Gandakasia
- Gangamopteris
- Ganister
- Ganopristis
- Gansus
- Gardner's relation
- Gardnos crater
- Gargantuavis
- Garibaldi Volcanic Belt
- Garita Creek Formation
- Garlock Fault
- Garnet
- Garnierite
- Garniss Curtis
- Gary Roskin
- Gasparinisaura
- Gasteroclupea
- Gatun structure
- Gauja Formation
- Gault
- Gauss-Matuyama reversal
- Gawler craton
- Gazzi-Dickinson method
- Gediminas Motuza
- Geerite
- Geigerite
- Gelasian
- Gelifluction
- Gellért Hill Cave
- Gemology
- Gemstone
- Genusaurus
- GeoArabia
- GeoRef
- GeoRef bibliographic database
- GeoRef database
- GeoSciML
- Geoarchaeology
- Geobase
- Geobiology
- Geochemical Society
- Geochemistry
- Geochimica et Cosmochimica Acta
- Geochronology
- Geochronometry
- Geocoma
- Geode
- Geodesy
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- Geodynamics
- Geoffrey Hattersley-Smith
- Geoforecasting
- Geogony
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- Geoid
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- Geologic hazards
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- Geologic province
- Geologic record
- Geologic temperature record
- Geologic time scale
- Geologic timeline of Western North America
- Geological Commission of the Cape of Good Hope
- Geological Conservation Review
- Geological Exploration of the Fortieth Parallel
- Geological Magazine
- Geological Society of America
- Geological Society of India
- Geological Society of London
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- Geological Society of Washington
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- Geological Survey of Canada
- Geological Survey of Newfoundland and Labrador
- Geological and geophysical engineering
- Geological history
- Geological history of Earth
- Geological history of Europe
- Geological history of Mars
- Geological history of Point Lobos
- Geological resistance
- Geological structure of Great Britain
- Geological survey
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- Geologist's hammer
- Geologists' Association
- Geologists Day
- Geology
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- Geology of Alderney
- Geology of Andorra
- Geology of Antarctica
- Geology of Australia
- Geology of Bedford County, Pennsylvania
- Geology of Bolivia
- Geology of British Columbia
- Geology of Chad
- Geology of Cheshire
- Geology of Chile
- Geology of China
- Geology of Colombia
- Geology of Connecticut
- Geology of Cornwall
- Geology of Delaware
- Geology of Dorset
- Geology of East Sussex
- Geology of England
- Geology of Europe
- Geology of Florida
- Geology of Fujian
- Geology of Georgia (U.S. state)
- Geology of Gloucestershire
- Geology of Gotland
- Geology of Great Britain
- Geology of Greenland
- Geology of Guernsey
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- Geology of Illinois
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- Geology of Somerset
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- Geology of Texas
- Geology of Turkey
- Geology of Uruguay
- Geology of Venus
- Geology of Wales
- Geology of West Virginia
- Geology of solar terrestrial planets
- Geology of the Alps
- Geology of the Antarctic Peninsula
- Geology of the Appalachians
- Geology of the Auckland Region
- Geology of the Australian Capital Territory
- Geology of the Bryce Canyon area
- Geology of the Capitol Reef area
- Geology of the Death Valley area
- Geology of the English counties
- Geology of the Faroe Islands
- Geology of the Grand Canyon area
- Geology of the Grand Teton area
- Geology of the Himalaya
- Geology of the Iberian Peninsula
- Geology of the Lassen volcanic area
- Geology of the Moon
- Geology of the Netherlands
- Geology of the North Sea
- Geology of the Northland Region
- Geology of the Pacific Northwest
- Geology of the Philippines
- Geology of the Pyrenees
- Geology of the Taranaki Region
- Geology of the Waikato-King Country Region
- Geology of the Wellington Region
- Geology of the Western Carpathians
- Geology of the Yosemite area
- Geology of the Zion and Kolob canyons area
- Geomagnetic excursion
- Geomagnetic jerk
- Geomagnetic pole
- Geomagnetic reversal
- Geomagnetic secular variation
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- Geophysical Journal International
- Geophysical Research Letters
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- Geophysiology
- Georg August Goldfuss
- Georg Hartmann
- Georg zu Münster
- George Barrow (geologist)
- George Edward Backus
- George Graham (clockmaker)
- George Perkins Merrill
- George Wetherill
- Georgia Depression
- Georgia Marble Company
- Georgiaite
- Georgina Basin
- Georgius Agricola
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- Geotechnics
- Geothermal areas of Yellowstone
- Geothermal electricity
- Geothermal energy
- Geothermal gradient
- Geothermobarometry
- Gephyrostegus
- Geranopterus
- Geranosaurus
- Gerhard vom Rath
- Gerhartsreiter Schichten
- Germanite
- Gerrothorax
- Geschiebekunde
- Getchellite
- Gething Formation
- Geyser
- Geyserite
- Gharib (crater)
- Gialo High
- Giant impact hypothesis
- Gibbsite
- Gibeon (meteorite)
- Gibraltar Arc
- Gigantosaurus
- Gilalite
- Gildersleeve Mountain
- Gillicus
- Gilmoreosaurus
- Gilsonite
- Giraffa jumae
- Girkin Formation
- Givetian
- Glacial Lake Algonquin
- Glacial Lake Ojibway
- Glacial erratic
- Glacial polish
- Glacial striation
- Glaciated Rocks
- Glacier
- Glacier cave
- Glacier morphology
- Glaciokarst
- Glaciolacustrine deposits
- Glaciology
- Glasford crater
- Glass with embedded metal and sulfides
- Glauberite
- Glaucodot
- Glauconie argileuse
- Glauconite
- Glaucophane
- Glen Canyon Group
- Glen Rose Formation
- Glenshaw Formation
- Glenwood Shale
- Gley soil
- Glikson crater
- Glières Plateau
- Global Boundary Stratotype Section and Point
- Global Standard Stratigraphic Age
- Global warming
- Glomeroporphyritic
- Glossary of geology
- Glossopteridales
- Glossotherium
- Gloucestershire Geology Trust
- Glover Bluff crater
- Glyptodontopelta
- Glyptotherium
- Gmelinite
- Gneiss
- Gobiatherium
- Gobipteryx
- Gobititan
- Godinotia
- Goethite
- Gogia
- Gojirasaurus
- Gokwe Formation
- Gold mining in the United States
- Goldich dissolution series
- Goldmanite
- Gomphos
- Gomphotaria
- Gondwana
- Gondwanatitan
- Gongxianosaurus
- Gonnardite
- Gonâve Microplate
- Gooch Creek Arch
- Gorda Plate
- Gorda Ridge
- Gormanite
- Gorstian
- Goslarite
- Gossan
- Gosses Bluff crater
- Gotland Basin
- Gotley Glacier
- Gough's Cave
- Gow crater
- Goyder crater
- Goyocephale
- Graben
- Graciliceratops
- Graciliraptor
- Graculavus
- Graded bedding
- Gradualism
- Graftonite
- Grainstone
- Granby crater
- Grand Coulee
- Grand Staircase
- Grandreefite
- Granite
- Granite Dells
- Granite Mountain (Texas)
- Granitoid
- Granoblastic
- Granodiorite
- Granophyre
- Granule (geology)
- Granulite
- Graphic texture
- Gratonite
- Gravel
- Gravel bar
- Gravelbourg Formation
- Gravitholus
- Gravity Recovery and Climate Experiment
- Gravity anomalies of Britain and Ireland
- Gravity anomaly
- Gravity of Earth
- Great Basin
- Great Dyke
- Great Falls Tectonic Zone
- Great Gaw Fault
- Great Glen Fault
- Great Lakes tectonic zone
- Great Oolite Formation
- Great Ordovician Biodiversification Event
- Great Oxygenation Event
- Great Sumatran fault
- Great Unconformity
- Great pond
- Green River Formation
- Green ubatuba
- Greendale Fault
- Greenhorn Limestone
- Greenhouse and icehouse Earth
- Greenhouse gas
- Greenland Plate
- Greenockite
- Greensand
- Greenschist
- Greenstone belt
- Greererpeton
- Gregory Beroza
- Gregory Rift
- Greigite
- Grenville orogeny
- Gres a Avicula contorta
- Gres a Dinosauriens Formation
- Gres de Labarre Formation
- Gres de l'Infralias
- Grey dune
- Grigory Gamburtsev
- Grillenburg Sandstone
- Griman Creek Formation
- Gritstone
- Gros Ventre landslide
- Grosmont Formation
- Grossite
- Grossopterus
- Grossular
- Ground-penetrating radar
- Ground penetrating radar survey (archaeology)
- Groundwater
- Groundwater recharge
- Groundwater sapping
- Group (stratigraphy)
- Grove Karl Gilbert
- Grunerite
- Grus (geology)
- Gruta das Torres
- Grypania
- Gryphon (geology)
- Grès et sables piquetés
- Grès à Reptiles
- Guadalupian
- Guaibasaurus
- Guanling Formation
- Guano
- Guanziling Hot Spring
- Gudmundur S. (Bo) Bodvarsson
- Guettioua Sandstone
- Guiana Shield
- Guichon Formation
- Guilleminite
- Guimarota
- Gulf Trough
- Gulf of Suez Rift
- Gummite
- Gurilynia
- Gusev crater (Russia)
- Guy Christian Collet
- Guyedong Beds
- Gweni-Fada crater
- Gypcrust
- Gypsum
- Gypsum Springs Formation
- Gyrodus
- Gyrosteus
- Gzhelian
- Géoscope (geology)
- HED meteorite
- HMRG Deep
- H chondrite
- HaMakhtesh HaGadol
- HaMakhtesh HaKatan
- Habanocnus
- Hack's law
- Hadean
- Hadrianus (genus)
- Hadrocodium
- Haffield Breccia
- Hagendorfite
- Haggertyite
- Haig Fras
- Hainina
- Haiweeite
- Halec
- Halide minerals
- Halimornis
- Halitherium
- Hallein Salt Mine
- Hallirhoidae
- Hallopora
- Halmahera Arc
- Halmahera Plate
- Haloclasty
- Halotrichite
- Halticosaurus
- Halwaxiida
- Hamada
- Hamberg Glacier
- Hamilton Group
- Hampen Marly Formation
- Hampshire Basin
- Hamstone
- Hamza River
- Hangenberg event
- Hans J. Hofmann
- Hanssuesia
- Hantong Formation
- Hanwulosaurus
- Hapalodectes
- Hapalodectidae
- Hapalops
- Hapkeite
- Haplocanthosaurus
- Haplophrentis
- Haptodus
- Haramiya
- Hardouinia
- Hardyston Quartzite
- Hardystonite
- Harebell Formation
- Harlan's muskox
- Harmer Glacier
- Harmonic tremor
- Harmotome
- Harold Jeffreys
- Harpagofututor
- Harrat Lunayyir
- Harrell Formation
- Harry Hammond Hess
- Harz granite
- Hasandong Formation
- Hastimima
- Hauerite
- Haughton impact crater
- Hausmannite
- Hauterivian
- Hauyne
- Haviland Crater
- Hawaii Undersea Research Laboratory
- Hawaii hotspot
- Hawaiian Trough
- Hawaiian eruption
- Hawaiian–Emperor seamount chain
- Hawk Mountain
- Hawleyite
- Hawthorn Group
- Haxonite
- Hayabusa
- Hayoceros
- Hayward Fault Zone
- Head (geology)
- Headward erosion
- Healdsburg Fault
- Heaney Glacier
- Heavy mineral
- Heazlewoodite
- Hebeiornis
- Hebridean Terrane
- Hedenbergite
- Hederellid
- Heelstone Ditch
- Hegetotheria
- Hegetotheriidae
- Heiberg Formation
- Heilongjiangosaurus
- Heinrich event
- Heinz Kohnen
- Heishansaurus
- Helen M. Duncan
- Helicoprion
- Hellenic arc
- Helvetic (geology)
- Hematite
- Hemicidaris
- Hemimorphite
- Hemisaurida
- Henbury Meteorites Conservation Reserve
- Henningsen Glacier
- Henricosborniidae
- Henry Benedict Medlicott
- Henry Cavendish
- Henry Gellibrand
- Henry Testot-Ferry
- Henry W. Posamentier
- Heptodon
- Herald Formation
- Herbert Hall Turner
- Herbertsmithite
- Hercynite
- Hermann Theodor Geyler
- Herringbone cross-stratification
- Hertfordshire puddingstone
- Herz Glacier
- Hesperocyoninae
- Hesperosaurus
- Hesperotestudo
- Hessite
- Heterodontosauriformes
- Heterohyus
- Heterolithic bedding
- Hettangian
- Heulandite
- Hexagonal crystal system
- Hexahedrite
- Hexameryx
- Hexaprotodon
- Heyuannia
- Hibolithes
- Hibonite
- Hiccles Cove Formation
- Hidden Lake Formation
- Hiemalora
- High Arctic Large Igneous Province
- High island
- Highland Boundary Fault
- Hilgardite
- Hilina Slump
- Hillier's Cave
- Hillman Hall of Minerals and Gems
- Hilt's law
- Himalayacetus
- Himalayan salt block
- Hindeodus
- Hipparion
- Hippidion
- Hippopotamus antiquus
- Hippopotamus gorgops
- Hirnantian
- Hironosaurus
- Hisanohamasaurus
- Hisingerite
- Historical earthquakes
- Historical geology
- Historical impacts of climate change
- History of creationism
- History of geology
- History of geomagnetism
- History of geophysics
- History of mineralogy
- History of mining in Sardinia
- History of paleontology
- History of the Earth
- History of the Rove Formation
- History of the petroleum industry in the United States
- Histriasaurus
- Hjulström curve
- Hoazinoides
- Hodges Glacier
- Hodgkinsonite
- Hoganas Formation
- Hogback (geology)
- Hoggar Mountains
- Hoko River Formation
- Holleford crater
- Holocene
- Holocene extinction
- Holocephali
- Holosteus
- Holston Formation
- Homalodotheriidae
- Homalodotherium
- Homerian
- Homilite
- Homocline
- Honanotherium
- Hong Kong Observatory
- Hongshanornis
- Honolulu Volcanic Series
- Hoodoo (geology)
- Hope Basin
- Hope Fault
- Hopeite
- Hoplophoneus
- Hoplophorus
- Hoplopteryx
- Horizon Deep
- Horn River Formation
- Hornblende
- Horned gopher
- Hornerstown Formation
- Hornfels
- Horolodectes sunae
- Horse (geology)
- Horse Lava Tube System
- Horseshoe Bend (Arizona)
- Horseshoe Canyon Formation
- Horsethief Sandstone
- Horsham Stone
- Horst (geology)
- Horst and graben
- Horusornithidae
- Hot spring
- Hotspot (geology)
- Houcheng Formation
- Houdek (soil)
- Houldjinian
- How the Earth Was Made
- Howardite
- Howel Williams
- Howlite
- Hsandagolian
- Hsanotherium
- Huabeisaurus
- Huajiying Formation
- Huanghetitan
- Huanglong Cave
- Huangnitang
- Huckleberry Ridge Tuff
- Hudiesaurus
- Hudson-Meng Bison Kill
- Hueco Mountains
- Hughmilleria
- Hugo Benioff
- Huincul Formation
- Huiquanpu Formation
- Hulitherium
- Hulsanpes
- Human fossil bones from the Muierii Cave and the Cioclovina Cave, Romania
- Humboldt Fault
- Humin
- Humite
- Hummelstown brownstone
- Hummocky cross-stratification
- Hunter-Bowen orogeny
- Huntley Mountain Formation
- Huntoniatonia
- Hureaulite
- Hutchinsonite
- Hutton's Unconformity
- Hutton Sandstone Formation
- Huttonite
- Hyalophane
- Hyalopilitic
- Hybodus
- Hydraulic action
- Hydraulic conductivity
- Hydraulic fracturing
- Hydraulic fracturing in the United Kingdom
- Hydridic Earth theory
- Hydrocarbon exploration
- Hydrogen cycle
- Hydrogen sulfide
- Hydrogeology
- Hydrogrossular
- Hydrokenoelsmoreite
- Hydrological phenomenon
- Hydrological transport model
- Hydrology
- Hydrology of Hungary
- Hydromagnesite
- Hydrothermal vent
- Hydrozincite
- Hynerpeton
- Hypercoryphodon
- Hypersolvus
- Hypersthene
- Hypocenter
- Hypselosaurus
- Hypsibema
- Hypsidoris
- Hypsocormus
- Hypsometric curve
- Hyrachyus
- Hyracodon
- Hyracodontidae
- Håleniusite-(La)
- Høgsfjord
- Hübnerite
- IIE iron meteorite
- Ianthasaurus
- Iapetus Ocean
- Iberian plate
- Iberomesornis
- Ibexian
- Icaronycteris
- Ice
- Ice VII
- Ice age
- Ice core
- Ice lens
- Ice scour
- Ice sheet dynamics
- Ice sheet model
- Ice tongue
- Iceland hotspot
- Iceland spar
- Ichabodcraniosaurus
- Ichnite
- Ichnofacies
- Ichnology
- Ichnotaxon
- Ichthyodectes ctenodon
- Ichthyodectidae
- Ichthyolestes
- Ichthyolith
- Ichthyotringa
- Ichthyotringa damoni
- Ictitherium
- Ida Helen Ogilvie
- Iddingsite
- Idosawa Fault
- Idrialite
- Igdabatis
- Ignacy Domeyko
- Igneous differentiation
- Igneous rock
- Ikaite
- Ilbandornis
- Iles Formation
- Ilimaussaq intrusive complex
- Ilingoceros
- Iljig Formation
- Illinoian (stage)
- Illinois Basin
- Illite
- Ilmakiur
- Ilmenite
- Ilokelesia
- Ilumetsa crater
- Ilvaite
- Ilyinets crater
- Imagocnus
- Imagotaria
- Imbrication (sedimentology)
- Impact Field Studies Group
- Impact crater
- Impact event
- Impact structure
- Impactite
- Imperial Fault Zone
- Impsonite
- In Beceten Formation
- Inaria
- Incised
- Inclusion (mineral)
- Incongruent melting
- Incremental dating
- Independence dike swarm
- Index fossil
- Index mineral
- Index of geology articles
- Index of plate tectonics articles
- Index to Marine & Lacustrine Geological Samples
- Indian Head Rock
- Indian Plate
- Indian River Bay
- Indian Shield
- Indite
- Indo-Australian Plate
- Indosaurus
- Indosuchus
- Indricothere
- Indroda Dinosaur and Fossil Park
- Induan
- Induced polarization
- Induced seismicity
- Industrial mineral
- Inertinite
- Inferior Oolite Formation
- Inge Lehmann
- Inge Lehmann Medal
- Inglis quarry
- Iniopteryx
- Inland sea (geology)
- Inner core
- Innuitian Mountains
- Innuitian orogeny
- Inosaurus
- Institut de Physique du Globe de Paris
- Institute of Vertebrate Paleontology and Paleoanthropology
- Institution of Mining and Metallurgy
- Insular Belt
- Insular Islands
- Insular Plate
- Integrated Ocean Drilling Program
- Interatheriidae
- Interbedding
- Interference colour chart
- Interference figure
- Interference ripples
- Interior Plains
- Interlake Formation
- Intermagnet
- Intermontane
- Intermontane Belt
- Intermontane Islands
- Intermontane Plate
- Intermontane Trench
- Internal heating
- Internal wave
- International Commission on Stratigraphy
- International Commission on the History of Geological Sciences
- International Geomagnetic Reference Field
- International Geoscience Programme
- International Latitude Observatory
- International Mineralogical Association
- International Society for Rock Mechanics
- International Union of Geodesy and Geophysics
- International Union of Geological Sciences
- Internide
- Interplate earthquake
- Intertidal wetland
- Intertrappean Beds
- Intraplate earthquake
- Intrusion
- Inversion (geology)
- Invertebrate paleontology
- Inyoite
- Iodargyrite
- Ionian
- Iranian plateau
- Iranotherium
- Iren Dabasu Formation
- Ireviken event
- Iridium anomaly
- Iron catastrophe
- Iron cycle
- Iron meteorite
- Iron ore
- Ironstone
- Irumide Belt
- Isaac Lea
- Isanosaurus
- Ischigualastia
- Ischyodus
- Ischyrhiza
- Ischyromys
- Ishbel Group
- Isisaurus
- Iso-Naakkima
- Isograd
- Isostasy
- Isostatic depression
- Isotemnidae
- Isotope geochemistry
- Israel Geological Society
- Isua greenstone belt
- Itacolumite
- Itapecuru Formation
- Itemirus
- Itoigawa-Shizuoka Tectonic Line
- Iturralde Crater
- Iuticosaurus
- Ivan Mushketov
- Ivan Yefremov
- Ivanantonia
- Izanagi Plate
- Izu-Ogasawara Trench
- Izuki Formation
- J. Clarence Karcher
- J. Lamar Worzel
- J. Willis Stovall
- J Harlen Bretz
- Jabal Waqf es Suwwan crater
- Jack Hills
- Jacobsite
- Jacobsville Sandstone
- Jadarite
- Jadeitite
- Jaduguda Uranium Mine
- Jagua Formation
- James A. Jensen
- James B. Macelwane
- James Dwight Dana
- James Gates Percival
- James Hopson
- James Hutton
- James Tennant (mineralogist)
- Jamesonite
- Jamoytius kerwoodi
- Jan Mayen Microcontinent
- Janassa
- Janenschia
- Janet Watson
- Japan Median Tectonic Line
- Jaramillo reversal
- Jarosite
- Jaroslav Perner
- Jasper Palisade
- Jasper conglomerate
- Jasperoid
- Javelina Formation
- Jaxartosaurus
- Jean Morlet
- Jeanne d'Arc Basin
- Jebel Duchan
- Jebel Qatrani Formation
- Jeffersonian Mammoth
- Jeffersonite
- Jeffersonville Limestone
- Jeholodens
- Jeholosaurus
- Jeita Grotto
- Jemez Lineament
- Jenkins Glacier
- Jennite
- Jeremejevite
- Jerrygibbsite
- Jethro Teall
- Jewel Geyser
- Jewell Glacier
- Jiangjunosaurus
- Jiangshanosaurus
- Jiangxia chaotoensis
- Jiangzhou Cave System
- Jimthompsonite
- Jingshanosaurus
- Jingxing Formation
- Jinhua Formation
- Jinju Formation
- Jinzhouornis
- Jinzhousaurus
- Jiutaisaurus
- Jixiangornis
- Joachim Barrande
- Jobaria
- Jobu Formation
- Jodhpur Group – Malani Igneous Suite Contact
- Johann Friedrich Ludwig Hausmann
- Johann Jakob Nöggerath
- Johannite
- John Arthur Phillips
- John Day Formation
- John Duer Irving
- John Eddowes Bowman the Elder
- John Hawkins (geologist)
- John Livermore
- John Marley (geologist)
- John Mawe
- John Milne
- John Peter Lesley
- John Phillips (geologist)
- John Smith Flett
- John Strong Newberry
- John T. Robinson
- John Tuzo Wilson
- John Vidale
- Joint (geology)
- Joli Fou Formation
- Jolliffeite
- Jon Claerbout
- Jonesite
- Jordanite
- Josef Augusta
- Josef Ladislav Píč
- Joseph Carne
- Joseph G. Medlicott
- Joseph Henry Collins
- Joseph Leidy
- Josephine Kablick
- Josephoartigasia monesi
- Journal of Climate
- Journal of Hydrometeorology
- Journal of Paleontology
- Journal of Volcanology and Geothermal Research
- Journal of the Atmospheric Sciences
- Journal of the Geological Society
- Juan de Fuca Plate
- Juan de Fuca Ridge
- Jubbulpuria
- Jubilee Diamond
- Judinornis
- Judith River Formation
- Judith River Group
- Judith Schiebout
- Julgoldite
- Juniata Formation
- Jurassic
- Jurassic Coast
- Juratyrant
- Jurong Formation
- Justus Ludwig Adolf Roth
- Jólnir
- Józef Grzybowski
- KNM ER 1805
- KNM ER 3733
- KNM ER 406
- KNM ER 992
- KNM WT 17000
- Kaali crater
- Kaapvaal craton
- Kaatialaite
- Kadsi Formation
- Kagasaurus
- Kaijiangosaurus
- Kaikō
- Kaili Formation
- Kainosite-(Y)
- Kaiparowits Formation
- Kakanaut Formation
- Kakisa Formation
- Kakuru
- Kaladongar Formation
- Kalahari Deposits
- Kalahari craton
- Kalazha Formation
- Kalininite
- Kalkkop crater
- Kallanakurichi Formation
- Kaluga crater
- Kamacite
- Kamchatka earthquakes
- Kame
- Kame delta
- Kamensk crater
- Kamil Crater
- Kamiokite
- Kampfite
- Kanawinka Geopark
- Kangaamiut dike swarm
- Kangnasaurus
- Kanguk Formation
- Kanimblan Orogeny
- Kankazagan Formation
- Kankite
- Kannemeyeria
- Kannemeyeriidae
- Kanoite
- Kansas Geological Survey
- Kanuites
- Kaolin Deposits of Charentes Basin, France
- Kaolinite
- Kara crater
- Karakul (Tajikistan)
- Karaurus
- Karikkoselkä
- Karl Bernhard Zoeppritz
- Karl Dietrich Eberhard Koenig
- Karl Eichwald
- Karl Ernst Adolf von Hoff
- Karl Georg von Raumer
- Karl Johann Bernhard Karsten
- Karl Ledersteger
- Karl Vogt
- Karla crater
- Karlite
- Karongasaurus
- Karoo Ice Age
- Karoo Supergroup
- Karoo System
- Karst
- Karst fenster
- Karst spring
- Kasimovian
- Kaskapau Formation
- Kaskaskia sequence
- Kasota limestone
- Katiki Formation
- Katsuhiko Ishibashi
- Katsuyamasaurus
- Kayenta Formation
- Kazakhstania
- Kazim Ergin
- Kačák Event
- Kebira Crater
- Keck Geology Consortium
- Keg River Formation
- Kegelite
- Keilite
- Keith Edward Bullen
- Keith Runcorn
- Kellaways Formation
- Kelly West crater
- Kelmayisaurus
- Kem Kem Beds
- Kenai Group
- Kenn Plateau
- Kenneth Carpenter
- Kenneth Farley
- Kenneth Hsu
- Kenneth Oakley
- Kenorland
- Kentland crater
- Kentriodon
- Kenyapotamus
- Keraterpeton
- Kerguelen Plateau
- Kerguelen hotspot
- Kerichwa Valley Tuff
- Kermadec-Tonga Subduction Zone
- Kermesite
- Kern Canyon Fault
- Kerogen
- Kerygmachela
- Kettle (landform)
- Ketton stone
- Keuper marl
- Keurusselkä
- Keweenaw Fault
- Key bed
- Keyite
- Keyser Formation
- Keystone (limestone)
- Kezilesu Formation
- Kgagodi crater
- Khaan
- Khanty Ocean
- Khetranisaurus
- Khodzhakul Formation
- Khok Kruat Formation
- Killadeas – Seskinore Fault
- Killas
- Kimberella
- Kimberlite
- Kimmeridge Clay
- Kimmeridgian
- Kin-Yip Chun
- Kingena
- Kingoria
- Kinnareemimus
- Kinnegoe Fault
- Kinoite
- Kiowa Shale
- Kirkwood Formation
- Kirtley F. Mather
- Kiskatinaw Formation
- Kitadani Formation
- Kivalina v. ExxonMobil Corporation
- Kiyoo Mogi
- Kiyoo Wadati
- Kizil Caves
- Kizylkumavis
- Kjerulf Glacier
- Klamelisaurus
- Kleptothule
- Klippe
- Klonk
- Knebelite
- Knickpoint
- Knotenschiefer
- Kochite
- Kodiak–Bowie Seamount chain
- Kogaionidae
- Kokoamu Greensand
- Kola Superdeep Borehole
- Kolbeckite
- Kolka-Karmadon rock ice slide
- Kolpochoerus
- Komatiite
- Konrad Bates Krauskopf
- Kootenai Formation
- Koparion
- Kope Formation
- Kopidodon
- Koreanosaurus (theropod)
- Kornerupine
- Kortrijk Formation
- Korycanar Formation
- Kota Formation
- Kotaneelee Formation
- Kotasaurus
- Kotcho Formation
- Koum Formation
- Kremersite
- Krennerite
- Krieselite
- Krotite
- Kryptops
- Kröhnkite
- Kuangyuan Series
- Kuehneotheriidae
- Kugitang Svita Formation
- Kuiper quadrangle
- Kukersite
- Kukharenkoite-(Ce)
- Kula-Farallon Ridge
- Kula Plate
- Kulceratops
- Kungurian
- Kunlun fault
- Kunmingosaurus
- Kuril–Kamchatka Trench
- Kurkar
- Kurnakovite
- Kursk Magnetic Anomaly
- Kursk crater
- Kuszholia
- Kutchicetus
- Kutnohorite
- Kuwajima Formation
- Kvabebihyrax
- Kvanefjeld
- Kyangyan Series
- Kyptoceras
- Kärdla crater
- König Glacier
- Kīpuka
- K–Ar dating
- K–T boundary
- LCROSS
- LL chondrite
- L chondrite
- La Amarga Formation
- La Biche Group
- La Boca Formation
- La Bocana Roja Formation
- La Chapelle-aux-Saints 1
- La Colonia Formation
- La Espuela Coal Mine disaster
- La Ferrassie 1
- La Matilde Formation
- La Moinerie crater
- La Predrera de Rubies Formation
- La Quinta Formation
- La Voulte-sur-Rhône (lagerstätte)
- Labocania
- Labradorite
- Lac des Îles igneous complex
- Lachlan Fold Belt
- Lacustrine
- Lacustrine plain
- Ladd Formation
- Ladinian
- Lady Knox Geyser
- Laevisuchus
- Lagerstätte
- Laghy Fault
- Laguna Colorada Formation
- Laguna Palacios Formation
- Laguna Salada Fault
- Lake Bosumtwi
- Lake Lappajärvi
- Lake Maumee
- Lake Timiskaming kimberlite field
- Lake Toba
- Lake Waco Formation
- Lake Wanapitei
- Lake Yanisyarvi
- Lakota Formation
- Lamaceratops
- Lamalginite
- Lamb Leer
- Lambeth Group
- Lameta Formation
- Lametasaurus
- Laminar flow
- Lamination (geology)
- Lammidhania
- Lamont–Doherty Earth Observatory
- Lamosite
- Lamplughsaura
- Lamproite
- Lanarkite
- Lanasaurus
- Lancanjiangosaurus
- Lance Formation
- Lancing Glacier
- Landform
- Landslide
- Landslide classification
- Landslide mitigation
- Langhian
- Lansfordite
- Lanthanite
- Lanthanosuchus
- Lanzhousaurus
- Laornis
- Lapilli
- Laplandite-(Ce)
- Laplatasaurus
- Lapparentosaurus
- Laptev Sea Rift
- Lapworth Medal
- Laramide orogeny
- Laramidia
- Large igneous province
- Large volume volcanic eruptions in the Basin and Range Province
- Largirostrornis
- Larry Martin
- Larvikite
- Lasanius
- Lastres Formation
- Latah Formation
- Late Cretaceous
- Late Devonian
- Late Devonian extinction
- Late Heavy Bombardment
- Late Imbrian
- Late Jurassic
- Late Miocene
- Late Mississippian
- Late Ordovician
- Late Pennsylvanian
- Late Pleistocene
- Late Triassic
- Latosol
- Latouchella
- Lau event
- Laurasia
- Laurence McKinley Gould
- Laurentia
- Laurentide ice sheet
- Laurite
- Lava
- Lava Creek Tuff
- Lava Flow Hazard Zones
- Lava delta
- Lava dome
- Lava field
- Lava filter
- Lava tube
- Lavacicle
- Lavendulan
- Law of included fragments
- Law of superposition
- Law of the wall
- Lawn Hill crater
- Lawrence Wager
- Lawson Adit
- Layered double hydroxides
- Lazulite
- Lazurite
- Lea Park Formation
- Lead-lead dating
- Lead (geology)
- Leadhillite
- Leanchoilia
- Leaverite
- Lechatelierite
- Lectavis
- Leduc Formation
- Legrandite
- Lehigh Gap
- Leightonite
- Leiosphaerid
- Lemurosaurus
- Lenesornis
- Lengenbach Quarry
- Lens (geology)
- Lens (hydrology)
- Leon County, Florida paleontological sites
- Leonard James Spencer
- Leonardite
- Leontinia
- Leontiniidae
- Lepidocrocite
- Lepidoderma
- Lepidolite
- Lepidotes
- Lepontin dome
- Leptauchenia
- Leptaucheniinae
- Leptecodon
- Leptictis
- Leptocyon
- Leptolepidae
- Leptolepis
- Leptomeryx
- Leptoropha
- Les Sables de Glos Formation
- Lessemsaurus
- Lestaillats Marls Formation
- Lestidiops
- Lethaia
- Lethiscus
- Leucogranite
- Levee
- Lewald Glacier
- Lewis Caleb Beck
- Lewisian complex
- Lexovisaurus
- Lhasa Plate
- Lherzolite
- Lianmuqin Formation
- Liaoxiornis
- Liard Formation
- Liassaurus
- Libanopristis
- Libethenite
- Libralces
- Libycosaurus
- Lichenometry
- Lichida
- Lickey Hills
- Liebigite
- Lied Glacier
- Liesegang rings (geology)
- Ligabueino
- Ligabuesaurus
- Light non-aqueous phase liquid
- Likhoelesaurus
- Limagne
- Limenavis
- Limestone
- Limestone pavement
- Limnic eruption
- Limnofregata
- Limognitherium
- Limonite
- Limpopo Belt
- Linarite
- Lineation (geology)
- Linguliformea
- Linhevenator
- Linnaeite
- Linthia
- Liptinite
- Liquiñe-Ofqui Fault
- Lirainosaurus
- Lisangou Formation
- Lisheen Mine
- Lissauer Breccia
- List of 2004-2009 earthquakes
- List of 20th-century earthquakes
- List of Cornish geologists and explorers
- List of Global Boundary Stratotype Sections and Points
- List of North American Deserts
- List of Penrose Medal winners
- List of Sites of Special Scientific Interest in Cornwall
- List of U.S. state minerals, rocks, stones and gemstones
- List of Wollaston Medal recipients
- List of caves in Brazil
- List of caves in China
- List of caves in the United States
- List of cinder cones
- List of deserts
- List of deserts by area
- List of dinosaur-bearing rock formations
- List of earth and atmospheric sciences journals
- List of earthquakes in California
- List of earthquakes in Sichuan
- List of fossil parks
- List of fossil sites
- List of fracture zones
- List of free geophysics software
- List of geochronologic names
- List of geological faults of England
- List of geological faults of Northern Ireland
- List of geological faults of Scotland
- List of geological faults of Wales
- List of geological features on Triton
- List of geological folds in Great Britain
- List of geological phenomena
- List of geologists
- List of geophysicists
- List of greenstone belts
- List of historic tsunamis
- List of impact craters in Africa
- List of impact craters in Antarctica
- List of impact craters in Asia
- List of impact craters in Australia
- List of impact craters in Canada
- List of impact craters in Europe
- List of impact craters in North America
- List of impact craters in South America
- List of impact craters on Earth
- List of important publications in geology
- List of karst springs
- List of landforms
- List of landslides
- List of lunar meteorites
- List of meteorite falls
- List of minerals
- List of minerals (complete)
- List of minerals M–O (complete)
- List of minerals named after people
- List of minor planets/7201–7300
- List of non-Dinosauria fossil trackway articles
- List of ophiolites
- List of orogenies
- List of pterosaur-bearing stratigraphic units
- List of rock formations in Serbia
- List of rock formations in the United Kingdom
- List of rock textures
- List of rock types
- List of sandstones
- List of shields and cratons
- List of spits (landforms)
- List of stratigraphic units with dinosaur body fossils
- List of stratigraphic units with dinosaur trace fossils
- List of stratigraphic units with dinosaur tracks
- List of stratigraphic units with indeterminate dinosaur fossils
- List of stratigraphic units with ornithischian tracks
- List of stratigraphic units with sauropodomorph tracks
- List of stratigraphic units with theropod tracks
- List of submarine topographical features
- List of supercontinents
- List of tectonic plate interactions
- List of tectonic plates
- List of types of amber
- List of uranium mines
- Listracanthus
- Lists of earthquakes
- Lists of mines
- Lists of mines in the United States
- Litchfieldite
- Lithalsa
- Lithic fragment (geology)
- Lithic sandstone
- Lithification
- Lithiophilite
- Lithoautotroph
- Lithogenic silica
- Lithology
- Lithosphere
- Lithostratigraphy
- Lithotope
- Litolophus
- Littoral zone
- Littorina Sea
- Liverpool crater
- Livingston Formation
- Livingstonite
- Lizard complex
- Llandovery epoch
- Llano Estacado
- Llano Uplift
- Llewellyn Formation
- Lobocarcinus
- Lobopodia
- Lochkovian
- Lock Haven Formation
- Lockatong Formation
- Lockne crater
- Lode
- Lodestone
- Loellingite
- Loess
- Logan Formation
- Logan Rock
- Logancha crater
- Logarithmic spiral beaches
- Logoisk crater
- Lohan Cura Formation
- Lomas Coloradas Formation
- Lomonosov Ridge
- Lonar crater
- Lonchodytes
- London-Brabant Massif
- London Basin
- London Clay
- Long Valley Caldera
- Longchengornis
- Longipteryx
- Longirostravis
- Longirostromeryx
- Longmenshan Fault
- Longwood Swallet
- Lophiaspis
- Lophiodon
- Lopingian
- Lopolith
- Lorandite
- Lord Howe Rise
- Lord Howe seamount chain
- Lorenzenite
- Lorne plateau lavas
- Los Alamitos Formation
- Los Blanquitos Formation
- Los Colorados Formation
- Los Hornitos Formation
- Losh, Wilson and Bell
- Losillasaurus
- Losing stream
- Lossie Mouth Sandstone Formation
- Lossiemouth Sandstone
- Lost City (hydrothermal field)
- Lost River Caverns
- Lost World Caverns
- Louann Salt
- Louis Agassiz
- Louis Caryl Graton
- Louis Dollo
- Louis L. Jacobs
- Louis Lartet
- Louisville hotspot
- Louisville seamount chain
- Lourinhasaurus
- Lourinhã Formation
- Love number
- Loveringite
- Low-velocity zone
- Low island
- Lower Dharmaram Formation
- Lower Karoo Group
- Lower Lias
- Lower Lufeng Series
- Lower Maleri Formation
- Lower plane bed
- Luanchuanraptor
- Luangwa (cynodont)
- Lucas Barrett
- Lucas Glacier
- Ludfordian
- Ludiortyx
- Ludlow epoch
- Ludwigite
- Lujanian
- Lukousaurus
- Lulzacite
- Lumparn
- Luna Leopold
- Lunar meteorite
- Luobi Cave
- Luohandong Formation
- Lupata Series
- Lupeosaurus
- Lura Formation
- Lushangfen Formation
- Lusitanosaurus
- Lusotitan
- Lustre (mineralogy)
- Lutetian
- Luxullianite
- Luzon Volcanic Arc
- Lycaenops
- Lycoptera
- Lycorhinus
- Lycosuchus
- Lynx Formation
- Lyonsite
- Lystromycter
- M. King Hubbert
- Maar
- Maastricht Formation
- Maastrichtian
- Mabdi Formation
- Macaque Cave
- Macaulayite
- Macdonaldite
- Macellum of Pozzuoli
- Maceral
- Macha crater
- Machaerid
- Machaeroides
- Machairodus
- Mackenzie dike swarm
- Mackenzie hotspot
- Mackunda Formation
- Macquarie Fault Zone
- Macrauchenidia
- Macraucheniidae
- Macrocephalochelys
- Macrocrystalline
- Macrodelphinus
- Macrodontophion
- Macrofossil
- Macroleter
- Macronaria
- Macrurosaurus
- Macula (planetary geology)
- Madison Group
- Madocite
- Madsenius
- Madygen Formation
- Mae Chan Fault
- Maelestes
- Mafic
- Maghemite
- Magma
- Magma current theory
- Magmatic underplating
- Magnesian Conglomerate
- Magnesioferrite
- Magnet Cove igneous complex
- Magnetic anomaly
- Magnetic declination
- Magnetic dip
- Magnetic mineralogy
- Magnetic survey (archaeology)
- Magnetite
- Magnetofossils
- Magnetostratigraphy
- Magnetotellurics
- Magnirostris
- Magsat
- Magulodon
- Magyarosaurus
- Mahadek Formation
- Mahantango Formation
- Main stem
- Majid Hassanizadeh
- Malachite
- Malacological Society of London
- Malapai Hill
- Malawisaurus
- Malayaite
- Malcolm McKenna
- Maleevus
- Maleri Formation
- Mammoth Hot Springs
- Mammut raki
- Mammuthus africanavus
- Mammuthus meridionalis
- Man Shield
- Mancos Shale
- Mandschurosaurus
- Mangerite
- Manhartsberg
- Manhattan schist
- Manicouagan Reservoir
- Manicouagan crater
- Maniraptoriformes
- Manitoba Group
- Manning formula
- Mannville Group
- Manson crater
- Mantellisaurus
- Mantle (geology)
- Mantle convection
- Mantle plume
- Mantle wedge
- Manual of Mineralogy
- Manuel Berberian
- Maotianshan Shales
- Maple Creek crater
- Maquoketa Caves State Park
- Maquoketa Group
- Marathon Uplift
- Marble
- Marble Canyon
- Marble Canyon (British Columbia)
- Marcasite
- Marcellin Boule
- Marcellus Formation
- Marcia McNutt
- Maree Formation
- Margaritasite
- Margarite
- Marginocephalia
- Margyang Formation
- Maria Gordon
- Maria Klenova
- Maria fold and thrust belt
- Marialite
- Mariana Plate
- Mariana Trench
- Maricite
- Marikina Valley Fault System
- Marine Geology
- Marine clay
- Marine geology
- Marine regression
- Marine transgression
- Marinite
- Marinoan glaciation
- Mariposite
- Marisaurus
- Mark McMenamin
- Marker horizon
- Marl
- Marland P. Billings
- Marlborough Fault System
- Marnes Irisees Superieures Formation
- Marnes a Belemnopsis latesulcatus Formation
- Marnes d'Auzas Formation
- Marnes de Bleville Formation
- Marnes de Chalin Formation
- Marnes de Dives Formation
- Marnes rouges de Roquelongue Formation
- Marquesas hotspot
- Marquez crater
- Marrella
- Marrite
- Marros Group
- Marshall Kay
- Marshalltown Formation
- Marshosaurus
- Marsupiocrinus
- Marsupites
- Marthozite
- Martian meteorite
- Martin Bott
- Martinsburg Formation
- Marvin Mangus
- Mary Anning
- Mary Dawson (paleontologist)
- Mary Somerville
- Marywadea
- Marília Formation
- Mascarene Plateau
- Masillaraptor
- Maskelynite
- Mass wasting
- Massetognathus
- Massif
- Massopoda
- Massospondylidae
- Mastodon
- Mastogloia Sea
- Masuk Formation
- Masuyite
- Matanuska Formation
- Mathematical geophysics
- Matlockite
- Matmor Formation
- Matrix-supported rock
- Matrix (geology)
- Matsuo Group
- Matt Lamanna
- Matthew Paul Moyle
- Maturity (geology)
- Maturity (sedimentology)
- Mauch Chunk Formation
- Maucherite
- Mauer 1
- Maumee Torrent
- Mauna Loa
- Mawsonites
- Maxberg specimen
- May 30, 1998 Afghanistan earthquake
- Mayan stage
- Mayenite
- Mayiacun Formation
- Mazuku
- McArthur Basin
- McCoy Brook Formation
- McKenzie Formation
- McKittrick Tar Pits
- McMurray Formation
- McRae Formation
- Mckelveyite
- Mean square weighted deviation
- Meander
- Meander scar
- Mecochirus longimanatus
- Medea hypothesis
- Medical geology
- Medicine Bow Formation
- Mediterranean Ridge
- Meeteetse Formation
- Megacerops
- Megacervixosaurus
- Megacryst
- Megahippus
- Megalocnus
- Megalosauridae
- Megalotragus
- Megarachne
- Megaraptor
- Megatapirus
- Megathrust earthquake
- Megatsunami
- Megatypus
- Megawhaitsia
- Meizoseismal area
- Melanophlogite
- Melanorosauridae
- Melanosome (geology)
- Melanterite
- Melbourne Bone Bed
- Melbournopterus
- Melilite
- Melissani Cave
- Melonechinus
- Meltwater pulse 1A
- Menaspis
- Mendeleev Ridge
- Mendipite
- Mendocino Fracture Zone
- Mendocino Triple Junction
- Mendozasaurus
- Mendozite
- Mene
- Mene purdyi
- Mene rhombea
- Menefee Formation
- Menefee Shale
- Mengyin Formation
- Mensa (geology)
- Meramec (series)
- Mercer Caverns
- Merchantville Formation
- Mercia Mudstone Group
- Mereheadite
- Merensky Reef
- Merenskyite
- Meridiungulata
- Meristina
- Merosaurus
- Merycoidodon
- Merycopotamus
- Mesa Rica Formation
- Mesaverde Formation
- Mesoarchean
- Mesocyon
- Mesohippus
- Mesolimulus
- Mesonychidae
- Mesonyx
- Mesopithecus
- Mesoplates
- Mesoproterozoic
- Mesoreodon
- Mesosaurus
- Mesosiderite
- Mesosphere (mantle)
- Mesozoic
- Mesozoic Marine Revolution
- Messelirrisor
- Messelobunodon
- Messinian
- Messinian evaporite
- Messinian salinity crisis
- Metacheiromys
- Metaconglomerate
- Metailurus
- Metal
- Metallogeny
- Metamorphic facies
- Metamorphic rock
- Metamorphism
- Metamynodon
- Metasediment
- Metasomatism
- Metaspriggina
- Metatorbernite
- Metavolcanic rock
- Metazeunerite
- Meteor Crater
- Meteor shower
- Meteorite
- Meteorite fall statistics
- Meteoritical Society
- Meteoroid
- Meteorological & Geoastrophysical Abstracts
- Meteorological Monographs
- Methane chimney
- Methane clathrate
- Metopaster
- Metoposauroidea
- Metoposaurus
- Metridiochoerus
- Miami Rock Ridge
- Miargyrite
- Miarolitic cavity
- Mica
- Michael Frogley
- Michael Tuomey
- Micraster
- Microbial mat
- Microbrachis
- Microcephale
- Microceratus
- Microcline
- Microcrystalline
- Microdontosaurus
- Microearthquake
- Microgeomatics
- Microlite
- Micropachycephalosaurus
- Micropaleontology
- Microprobe
- Microsauria
- Microseism
- Microurania
- Microvenator
- Mid-Atlantic Ridge
- Mid-Brunhes Event
- Mid-ocean ridge
- Midcontinent Rift System
- Middle America Trench
- Middle Cambrian
- Middle Devonian
- Middle Jurassic
- Middle Miocene
- Middle Miocene disruption
- Middle Mississippian
- Middle Ordovician
- Middle Pennsylvanian
- Middle Pleistocene
- Middle Triassic
- Middlesboro crater
- Midlothian Coalfield
- Mien (lake)
- Mifune Group
- Mifunesaurus
- Migmacastor
- Migmatite
- Mihune Formation
- Mikael Fortelius
- Milankovitch cycles
- Mile Canyon
- Milford granite (Massachusetts)
- Milk River Formation
- Millerite
- Millstone Grit
- Milutin Milanković
- Mina Rosita Vieja disaster
- Mina de Barroterán coal mine disaster
- Mineral
- Mineral Fork Formation
- Mineral collecting
- Mineral exploration
- Mineral physics
- Mineral wax
- Mineralization (geology)
- Mineralogical Society of America
- Mineralogy
- Mineralogy of the Pikes Peak Region
- Mineraloid
- Mining
- Miniochoerus
- Ministry of Mineral Resources (Sierra Leone)
- Minnesota Geological Survey
- Minoan eruption
- Minyulite
- Miocene
- Miogeocline
- Miopelecanus
- Miotapirus
- Mir mine
- Mirabilite
- Mirali Qashqai
- Miria Formation
- Mirovia
- Mishina Gora crater
- Mississippian
- Mistastin crater
- Mitchell Plain
- Mitilanotherium
- Mitrate
- Mitsukurinidae
- Mitsuse Formation
- Mixopterus
- Mixotoxodon
- Mizarai crater
- Mjølnir crater
- Moab Fault
- Moabosaurus
- Mochlodon
- Moenave Formation
- Moenkopi Formation
- Moghreberia
- Mogote
- Mohammed Naseeb Qureshy
- Mohite
- Mohorovičić discontinuity
- Mohrite
- Mohs scale of mineral hardness
- Moine Supergroup
- Moine Thrust Belt
- Molasse
- Molasse basin
- Moldanubian Zone
- Moldavite
- Molecap Greensand
- Mollie's Nipple
- Molucca Sea Collision Zone
- Molucca Sea Plate
- Monadnock
- Monazite
- Mongolosaurus
- Monkonosaurus
- Monocline
- Monogenetic volcanic field
- Monograptus
- Monolophosaurus
- Mononykus
- Mono–Inyo Craters
- Monta Vista Fault
- Montagnais crater
- Montanoceratops
- Monte Nuovo
- Montehermosan
- Monterey Formation
- Montian
- Montmorillonite
- Montney Formation
- Monturaqui crater
- Monuran trackway
- Monzonite
- Mooihoekite
- Moon-Airel Formation
- Moon rock
- Moonquake
- Mooreville Chalk Formation
- Moraine
- Morainic drift
- Morais Ophiolite Complex
- Morasko meteorite nature reserve
- Moreno Formation
- Moreno Hill Formation
- Morion (mineral)
- Morokweng crater
- Moropus
- Morris Glacier
- Morrison Formation
- Morton Gneiss
- Moschellandsbergite
- Moscovian
- Moscow Paleontological Museum
- Motagua Fault
- Motonori Matuyama
- Mottramite
- Mount Blanco
- Mount Defiance (New York)
- Mount Elkins
- Mount Everest
- Mount Garibaldi
- Mount Independence
- Mount Laurel Formation
- Mount Meager
- Mount Nittany
- Mount Scott (Clackamas County, Oregon)
- Mount St. Helens
- Mount Tambora
- Mount Toondina crater
- Mount Vesuvius
- Mountain
- Mountain formation
- Mouth bar
- Mowry Shale Formation
- Mpandi Formation
- Mporokoso Group
- Mud
- Mud volcano
- Mudcrack
- Muddy River (Washington)
- Mudflow
- Mudpot
- Mudrock
- Mudslide
- Mudstone
- Muela de Ares
- Mugher Mudstone Formation
- Mulde event
- Multiple-indicator kriging
- Mundite
- Munising Formation
- Muonionalusta
- Murchison meteorite
- Murray Basin
- Murtoi Formation
- Musashino Terrace
- Muschelkalk
- Muscovite
- Musgrave Block
- Muskeg Formation
- Muskiki Formation
- Muskwa Formation
- Mussaurus
- Muva
- Muyelensaurus
- Mycterops
- Mycterosaurus
- Mylagaulidae
- Mylonite
- Myra Keen
- Myreton Hill
- Mélange
- NASA/IPAC Extragalactic Database
- NASA STI Program
- NG 6
- Nabalamprophyllite
- Nachtigal Glacier
- Nacimiento Formation
- Nadir (topography)
- Nagdong Formation
- Nagyagite
- Nahanni Formation
- Nain province
- Nakhla meteorite
- Naknek Formation
- Nakusia
- Nalacetus
- Naldrettite
- Nam Phong Formation
- Namacalathus
- Nambaroo
- Nambulite
- Namurotypus
- Nankai megathrust earthquakes
- Nanningosaurus
- Nanogeoscience
- Nanopareia
- Nanshiungosaurus
- Nanyangosaurus
- Napan Formation
- Napier Mountains
- Nappe
- Narooma Terrane
- Nash–Sutcliffe model efficiency coefficient
- National Association of Black Geologists and Geophysicists
- National Center for Earth-surface Dynamics
- National Elevation Dataset
- National Fossil Day
- National Geology and Mining Service
- National Geomagnetism Program
- National Ice Core Laboratory
- National Seismological Service
- Native copper
- Native element minerals
- Native metal
- Natrocarbonatite
- Natural Arch, Tirumala hills
- Natural arch
- Natural history
- Natural remanent magnetization
- Naturaliste Plateau
- Nature Geoscience
- Navajo Sandstone
- Navarin Canyon
- Navesink Formation
- Nazca Plate
- Nazca Ridge
- Neanis
- Near-Earth object
- Near-surface geophysics
- Neath Disturbance
- Necrolemur
- Necrolestes
- Necromanis
- Nectarian
- Nectridea
- Nedcolbertia
- Needmore Formation
- Neimongosaurus
- Nekrasovite
- Nelsen Formation
- Nemegt Formation
- Nemegtomaia
- Nemegtosaurus
- Nena (supercontinent)
- Nenadkevichite
- Neo-creationism
- Neoarchean
- Neocathartes
- Neochoerus
- Neochoerus pinckneyi
- Neocomian Sands
- Neogaeornis
- Neogene
- Neoglyphiocerataceae
- Neoglyphioceratidae
- Neohelos
- Neohibolithes
- Neoicocerataceae
- Neoicoceratidae
- Neomorphism
- Neoproterozoic
- Neornithischia
- Neosauropoda
- Neosaurus
- Neostacheoceratidae
- Neotectonics
- Neovenator
- Nepheline
- Nepheline syenite
- Neptunism
- Nesodon
- Nestoritherium
- Neugrund crater
- Neuquenornis
- Neuquensaurus
- Neuquén Group
- Nevadan orogeny
- Nevadia
- New Albany Shale
- New Eddystone Rock
- New Hebrides Plate
- New Oxford Formation
- New Red Sandstone
- New Zealand Swan
- New islands
- Newark Basin
- Newark Canyon Formation
- Newark Group
- Newmarracarroceras
- Newport-Inglewood Fault
- Newporte crater
- Newry Fault
- Newton Horace Winchell
- Newtonsaurus
- Ngalia Basin
- Ngexisaurus
- NiFe
- Niagara Escarpment
- Niah National Park
- Nicholas Shackleton
- Nicholson crater
- Nichromite
- Nickel deposits of Finland
- Nickel–Strunz classification
- Nicolas Steno
- Niedermayrite
- Nigel Anstey
- Nikanassin Formation
- Nikkasaurus
- Nikolay Urvantsev
- Nimbadon
- Nimbahera stone
- Nimbia
- Nimravus
- Niningerite
- Niobrara Formation
- Niobrarateuthis
- Nipponites
- Nittany Arch
- Nittany Valley
- Noasauridae
- Noasaurus
- Nodosaurus
- Nodule (geology)
- Noguerornis
- Noir Belge
- Noir de Golzinne
- Noir de Mazy
- Nomingia
- Nomismocerataceae
- Nomismoceratidae
- Nonesuch Shale
- Nootka Fault
- Nopcsaspondylus
- Nor'Wester Mountains
- Norfolk Ridge
- Norian
- Noritaceae
- Norite
- Noritidea
- Normal moveout
- Norman Haskell
- Norman L. Bowen
- Normannites
- North American Plate
- North Atlantic Igneous Province
- North China craton
- North Island Fault System
- North Island Takahē
- North Magnetic Pole
- North West Highlands Geopark
- Northampton Sands Formation
- Northern Cordilleran Volcanic Province
- Northern Harz Boundary Fault
- Northern river reversal
- Norwood Ridge
- Nosean
- Nostoceratidae
- Nothocyon
- Nothropus
- Nothrotheriops
- Nothrotherium
- Notioprogonia
- Notoceratops
- Notohippidae
- Notorhynchus
- Notostylopidae
- Notostylops
- Nototherium
- Novacaesareala
- Novopangaea
- Nqwebasaurus
- Nubian Sandstone
- Nubian Sandstone Aquifer System
- Nubian Swell
- Nuclear Explosions for the National Economy
- Nuculoceratidae
- Numidotheriidae
- Nunatak
- Nurosaurus
- Nuthetes
- Népouite
- Nördlinger Ries
- OH 24
- OH 5
- OH 7
- Oak Ridges Moraine
- Oamaru stone
- Oasis crater
- Obduction
- Obere Bunte Mergel
- Obolon' crater
- Obsidian
- Ocala Limestone
- Ocala Platform
- Ocean-bottom seismometer
- Ocean Drilling Program
- Ocean acidification
- Ocean island basalt
- Oceanic basin
- Oceanic core complex
- Oceanic crust
- Oceanic trench
- Oceans of Kansas Paleontology
- Ochil Fault
- Ochoan
- Octahedrite
- Odessa Meteor Crater
- Odobenocetops
- Odontogriphus
- Odontornithes
- Oecoptychius
- Oecotraustes
- Oedaleops
- Officer Basin
- Offshore (hydrocarbons)
- Offshore survey
- Ogallala Aquifer
- Ogygoptynx
- Ohmdenosaurus
- Oil sands
- Oil shale
- Oil shale geology
- Oil shale reserves
- Ojinaga Formation
- Okhotsk Plate
- Okribites
- Okurodani Formation
- Old Faithful
- Old Port Formation
- Old Red Sandstone
- Oldest dated rocks
- Oldest known object on Earth
- Oldfieldthomasiidae
- Oldhamia
- Oldman Formation
- Oleanane
- Oleg Fisunenko
- Olenekian
- Oligocene
- Oligokyphus
- Olistostrome
- Oliver Bulman
- Oliver Perry Hay
- Olivine
- Olson's Extinction
- Oltu stone
- Olympic-Wallowa Lineament
- Omagh Fault
- Omagh Thrust
- Omeisaurus
- Omnivoropteryx
- Omphacite
- On Gong Formation
- Oncala Group
- Oncolite
- Ondorukhaa Formation
- OneGeology
- Onega stepanovi
- Onlap
- Onondaga (geological formation)
- Onondaga Formation
- Onshore (hydrocarbons)
- Ontario Geological Survey
- Ontong Java Plateau
- Onychopterella
- Ooid
- Oolite
- Oolitic aragonite sand
- Opabinia
- Opal Pool
- Ophiacodon
- Ophiacodontidae
- Ophiderpeton
- Ophiderpetontidae
- Ophioceratidae
- Ophiolite
- Oppelia
- Optical relief
- Orbicular granite
- Orca Basin
- Orcadian Basin
- Orcomimus
- Ordinary chondrite
- Ordovician
- Ordovician–Silurian extinction event
- Ordóñezite
- Ore genesis
- Oregonite
- Organic-rich sedimentary rocks
- Organic geochemistry
- Orientation tensor
- Origin of water on Earth
- Original horizontality
- Orlock Bridge Fault
- Ornatifilum
- Ornatotholus
- Ornithodesmus
- Ornithomimoides
- Ornithomimus
- Orodromeus
- Orodus
- Orogeny
- Orohippus
- Oronto Group
- Orosirian
- Orpiment
- Orthacanthus
- Orthoclase
- Orthogarantiana
- Orthrozanclidae
- Orthrozanclus
- Orulganitidae
- Osbornodon
- Oscar Montgomery Lieber
- Oseberg oil field
- Oshanosaurus
- Osmiridium
- Osmond Fisher
- Osteodontornis
- Ostracod Limestone
- Osumilite
- Otavite
- Othenio Abel
- Othnielosaurus
- Otocerataceae
- Otoceratidae
- Otoceratina
- Otogosaurus
- Otoites
- Otsheria
- Ottawa-Bonnechere Graben
- Otto Jaekel
- Ottrelite
- Ouachita orogeny
- Ouarkziz crater
- Oum ed Diab Formation
- Outburst flood
- Outcrop
- Outer core
- Outer trench swell
- Outline of geophysics
- Outwash fan
- Ovatoscutum
- Overburden
- Overburden pressure
- Overdeepening
- Overwash
- Oxbow lake
- Oxetocyon
- Oxford Clay Formation
- Oxfordian (stage)
- Oxide minerals
- Oxyacodon
- Oxyaena
- Oxycerites
- Oxydactylus
- Oxygen-18
- Oxygen isotope ratio cycle
- Oxynoticeras
- Oyu Tolgoi mine
- Ozraptor
- POLARIS (seismology)
- Paasselkä
- Pab Formation
- Pachyaena
- Pachycormus
- Pachyrukhos
- Pachyteuthis
- Pachytheca
- Pachythrissops
- Pacific-Antarctic Ridge
- Pacific-Farallon Ridge
- Pacific-Kula Ridge
- Pacific Northwest Seismic Network
- Pacific Plate
- Packard Formation
- Padragosiceras
- Paha (landform)
- Paibian
- Painite
- Paja Formation
- Pakisaurus
- Pakowki Formation
- Palaeeudyptes
- Palaeeudyptes antarcticus
- Palaeeudyptes gunnari
- Palaeeudyptes klekowskii
- Palaeeudyptinae
- Palaeocarpilius
- Palaeogene
- Palaeogeography
- Palaeogeography, Palaeoclimatology, Palaeoecology
- Palaeohatteria
- Palaeolagus
- Palaeoloxodon
- Palaeolycus
- Palaeomastodon
- Palaeonisciformes
- Palaeoniscum
- Palaeophonus
- Palaeoryctes
- Palaeoryctoid
- Palaeos
- Palaeosauriscus
- Palaeospheniscus
- Palaeospheniscus bergi
- Palaeospheniscus biloculatus
- Palaeospheniscus gracilis
- Palaeospheniscus patagonicus
- Palaeospheniscus wimani
- Palaeosyops
- Palaeotherium
- Palaeotis
- Palaeotragus
- Palaeotringa
- Palaeoxylology
- Palagonite
- Palastericus
- Palau Formation
- Paleo-Tethys Ocean
- Paleoarchean
- Paleoatmosphere
- Paleobiology (journal)
- Paleobiota of the Niobrara Formation
- Paleobotany
- Paleocene
- Paleocene dinosaur
- Paleocene–Eocene Thermal Maximum
- Paleoclimatology
- Paleocollapse
- Paleocoma
- Paleoctenophora brasseli
- Paleocurrent
- Paleodictyon
- Paleodictyon nodosum
- Paleoecology
- Paleogene
- Paleogeology
- Paleolimnology
- Paleomagnetism
- Paleomap
- Paleontological Institute, Russian Academy of Sciences
- Paleontological Society
- Paleontology
- Paleopedology
- Paleoproterozoic
- Paleoseismology
- Paleosol
- Paleotempestology
- Paleothermometer
- Paleozoic
- Paleozoology
- Palintropus
- Pallasite
- Palliser Formation
- Palmason Model
- Palorchestes
- Palpebral (bone)
- Paludal
- Palustrine
- Pambdelurion
- Pamirioceras
- Pan-African Ocean
- Pan-African orogeny
- Panasqueira
- Pangaea
- Pangaea Ultima
- Panhole
- Pannotia
- Panochthus
- Panoplosaurus
- Pantelosaurus
- Panthalassa
- Panthera leo vereshchagini
- Pantodonta
- Pantolambda
- Pantophilus
- Pantylus
- Paraceltitidae
- Paraceltitina
- Paradox Basin
- Paraenhydrocyon
- Paragastrioceratidae
- Paragastrioceratinae
- Paragenesis
- Paraglacial
- Parahesperornis
- Parahippus leonensis
- Parahoplitidae
- Parahoplitinae
- Paraisobuthus
- Paralepis
- Paralithic
- Paramachairodus
- Paramylodon
- Paramys
- Paranauchenia
- Paranthodon
- Paraperrinitinae
- Paraphysornis
- Parapropalaehoplophorus
- Paraprotopteryx
- Paraptenodytes brodkorbi
- Paraptenodytes robustus
- Parapuzosia
- Parascopelus
- Parashumarditidae
- Parastrenoceras
- Paratethys
- Parathrinaxodon
- Paratornoceratinae
- Parenchodus
- Parent rock
- Parexus
- Pari Aike Formation
- Parisangulocrinus
- Parisite-(Ce)
- Parmularius
- Parodoceratidae
- Paronychodon
- Parsonsite
- Partial melting
- Particle size
- Particle size (grain size)
- Parvancorina
- Parvicursor
- Paso del Sapo Formation
- Pasquiaornis
- Passaic Formation
- Patagonykus
- Patagosaurus
- Patcham Formation
- Pate Hole
- Patrick Marshall
- Patronite
- Pattillo Higgins
- Patuxent Formation
- Paul's Island
- Paul Renne
- Paulscherrerite
- Pavlovia
- Paw Paw Formation
- Peace River Formation
- Peace River Formation (Florida)
- Peak oil
- Peale's Barber Farm Mastodon Exhumation Site
- Pebble
- Pebble Creek Formation
- Pebbly Arkose Formation
- Pecopteris
- Pediment (geology)
- Pedogenesis
- Pedosphere
- Pegmatite
- Peishansaurus
- Pekin Formation
- Pelagic sediment
- Pelargorhynchus
- Pelite
- Pellegrinisaurus
- Pelso Plate
- Peltobatrachus
- Peléan eruption
- Penelopognathus
- Pengana
- Penglaizhen Formation
- Penikisite
- Peninj Mandible
- Peninsular Arch
- Peninsular Gneiss
- Pennant Measures
- Pennsylvania Bluestone
- Pennsylvania Geological Survey
- Pennsylvanian
- Penokean orogeny
- Penroseite
- Penta Geyser
- Pentacrinites
- Pentamerus
- Pentasteria
- Pentlandite
- Pentremites
- Peperite
- Peramuridae
- Percrocuta
- Perennial stream
- Pericyclaceae
- Pericyclidae
- Pericyclinae
- Pericycloceratidae
- Peridot
- Peridotite
- Period (geology)
- Perisphinctes
- Perite
- Permeability (earth sciences)
- Permian
- Permian Sea
- Permian–Triassic extinction event
- Permineralization
- Permo-Carboniferous
- Perovskite
- Perovskite (structure)
- Perrinitidae
- Perrinitinae
- Persistence (discontinuity)
- Perturbation (geology)
- Peru-Chile Trench
- Petalodontiformes
- Petalodus
- Pete Larson
- Peter Clift
- Peter Dodson
- Peter Galton
- Peter Huybers
- Peter Szatmari (geologist)
- Petermann Orogeny
- Peters Glacier
- Petoskey stone
- Petrified Forest (Sarmiento)
- Petrified Springs fault
- Petrogenesis
- Petrographic microscope
- Petrography
- Petroleum geochemistry
- Petroleum geologist
- Petroleum geology
- Petroleum seep
- Petrological Database of the Ocean Floor
- Petrology
- Petrophysics
- Petrus Peregrinus de Maricourt
- Pettigoe Fault
- Petuntse
- Petzite
- Pezosiren
- Phacolith
- Phacopidae
- Phacopoidea
- Phanerite
- Phaneritic
- Phanerozoic
- Pharmacosiderite
- Pharyngolepis
- Phaulostephanus
- Phenacoceratidae
- Phenocryst
- Philip England
- Philip R. Bjork
- Philip Rashleigh
- Philippi Glacier (South Georgia)
- Philippine-Halmahera Arc
- Philippine Fault System
- Philippine Mobile Belt
- Philippine Sea Plate
- Phiomia
- Phlaocyon
- Phlebolepis
- Phlegethontia
- Phlogopite
- Phoenix Plate
- Phoenix Ridge
- Pholiderpeton
- Pholidocercus
- Pholidophorus
- Phosphate Beds
- Phosphate minerals
- Phosphophyllite
- Phosphorite
- Phosphuranylite
- Phreatic
- Phreatic eruption
- Phreatomagmatic eruption
- Phthinosuchus
- Phu Kradung Formation
- Phuwiangosaurus
- Phylactocephalus
- Phyllite
- Phylloceratina
- Phyllodus
- Phyllolepis
- Phylum
- Phymosoma
- Physical geodesy
- Physics and Chemistry of Minerals
- Physogaleus
- Piacenzian
- Piatnitzkysaurus
- Piccaninny crater
- Piceance Basin
- Pichilemu Fault
- Pictured Cliffs Formation
- Piedras del Tunjo Archaeological Park
- Piemont-Liguria Ocean
- Pieniny Klippen Belt
- Pierce Brodkorb
- Pierre Bouguer
- Pierre Formation
- Pierre Martin (engineer)
- Pierre Perrault (1608–1680)
- Pierre Shale
- Pierre de Jaumont
- Pietraroia Plattenkalk
- Pigeonite
- Pikaia
- Pikes Peak granite
- Pilbara craton
- Pilgrimella
- Pillow lava
- Pillow structure
- Pilot crater
- Pinalite
- Pine Point Formation
- Pingo
- Pingualuit crater
- Pinyon Conglomerate
- Pipeflow
- Pisanosaurus
- Pit cave
- Pit crater
- Pitcairn hotspot
- Pittsburg-Weir Coalfield
- Pittsburgh Coalfield
- Pittsburgh coal seam
- Pituriaspida
- Pituriaspis doylei
- Piveteausaurus
- Placer deposit
- Placerias
- Plagioclase
- Plagiosternum
- Plain
- Planar deformation features
- Planation
- Plancheite
- Planetary Data System
- Planetary differentiation
- Planetary engineering
- Planetary geology
- Planetary science
- Planetetherium
- Planicoxa
- Planiplastron
- Plankton
- Platanaster
- Plate Boundary Observatory
- Plate reconstruction
- Plate tectonics
- Plateosauravus
- Plateosauria
- Plateosauridae
- Platform (geology)
- Platform cover
- Plating (geology)
- Platinum Metals Review
- Platteville Limestone
- Plattnerite
- Platybelodon
- Platyceratops
- Platygonus
- Platyhystrix
- Platysomus
- Platystrophia
- Playfair's Law
- Pleasanton Fault
- Plegiocidaris
- Pleistocene
- Plesiadapidae
- Plesiadapiformes
- Plesiadapis
- Plesictis
- Plesiocidaris
- Plesiolampas
- Pleurocoelus
- Pleurocystites
- Pleuromeia
- Pleuronodoceratidae
- Pliensbachian
- Plinian eruption
- Pliocene
- Pliohyrax
- Pliopedia
- Plume tectonics
- Plunge pool
- Plus minus method
- Pluton
- Pluvial
- Pneumatolysis
- Pockmark
- Pocono Formation
- Podokesaurus
- Poebrotherium
- Poecilomorphus
- Poekilopleuron
- Pogonodon
- Poikilitic
- Point Loma Formation
- Point Lookout Sandstone
- Point bar
- Polar drift
- Polar motion
- Polarite
- Polarity reversal
- Pole shift hypothesis
- Poleumita
- Polje
- Pollucite
- Polybasite
- Polycrase
- Polygenetic volcanic field
- Polystrate fossil
- Ponerosteus
- Ponor
- Pontosmilus
- Popanocerataceae
- Popanoceratidae
- Popigai crater
- Popo Agie Formation
- Popping Stone
- Porcellanite
- Porcupine Hills Formation
- Porosity
- Porphyritic
- Porphyroblast
- Porphyroclast
- Porphyry (geology)
- Port Hills Fault
- Port Kennedy Bone Cave
- Portland Formation
- Portland stone
- Portlandite
- Posidonienschiefer
- Post-glacial rebound
- Post-perovskite
- Postcrania
- Posttornoceratidae
- Posttornoceratinae
- Potamal
- Potamornis
- Potamotherium
- Pothole (geology)
- Potomac Formation
- Potsdam Sandstone
- Potton Sands
- Pottsville Formation
- Pounamu
- Pradhania
- Praebigotites
- Praecambridium
- Praeglyphioceratidae
- Praeornis
- Praeparkinsonia
- Praestrigites
- Pragian
- Prairie Bluff Chalk Formation
- Pranhita–Godavari Basin
- Pre-Nectarian
- Precambrian
- Precarious boulder
- Precursor (bird)
- Predator trap
- Prehistoric life
- Prehistoric mammal
- Prehistoric tsunamis
- Prehnite
- Prehnite-pumpellyite facies
- Preiesener Formation
- Presbyornis
- President of the Geological Society of London
- Presqu'île crater
- Pressure solution
- Presumpscot Formation
- Priabonian
- Priddy Caves
- Pridoli
- Primapus
- Primitive mantle
- Primordial element
- Primordial water
- Principle of faunal succession
- Principle of original horizontality
- Principles of Geology
- Prionocerataceae
- Prionoceratidae
- Prionoceratinae
- Prionolepis
- Priscacara
- Prism (geology)
- Pristerognathus
- Pristerognathus Assemblage Zone
- Pristiguana
- Proardea
- Proarticulata
- Probactrosaurus
- Probainognathidae
- Probainognathus
- Problems in coal mining
- Proburnetia
- Procamelus
- Proceratosaurus
- Procerites
- Procerosaurus
- Procoptodon
- Procynosuchidae
- Procynosuchus
- Prodeinodon
- Prodeinotherium
- Prodromitidae
- Proglacial lakes of Minnesota
- Progradation
- Project Mohole
- Prolibytherium
- Prolobitidae
- Prolobitinae
- Promegatherium
- Proornis
- Propalaeocastor
- Propanoplosaurus
- Propantes
- Prophaethon
- Propliopithecus
- Propylitic alteration
- Prorastomus
- Prorsisphinctes
- Prosantorhinus
- Prosqualodon
- Protapirus
- Protarchaeopteryx
- Protaspididae
- Protemnodon
- Proterozoic
- Protichnites
- Protitanops
- Proto-Tethys Ocean
- Protobrama
- Protoceras
- Protoceratinae
- Protocetus
- Protochelydra
- Protoclepsydrops
- Protoecotrausites
- Protognathosaurus
- Protoichnites
- Protolith
- Protophasma
- Protopteryx
- Protorthoptera
- Protungulatum
- Protylopus
- Protypotherium
- Proustite
- Psammite
- Psammosteidae
- Psaronius
- Pseudaelurus
- Pseudaptenodytes
- Pseudarietitinae
- Pseudoclymeniidae
- Pseudofossil
- Pseudogarantiana
- Pseudogastrioceratinae
- Pseudohaloritaceae
- Pseudohaloritidae
- Pseudohaloritinae
- Pseudoltinomys
- Pseudomalachite
- Pseudoparalegoceratidae
- Pseudopetalichthyida
- Pseudoprotoceras
- Pseudotachylite
- Pseudotirolitidae
- Pseudotoites
- Pseudotribos
- Psilophyton
- Pteraspida
- Pteraspis
- Pteridinium
- Pterocoma
- Pteropelyx
- Pterospondylus
- Ptolemaiida
- Ptychodus
- Pucabatis
- Pucapristis
- Puchezh-Katunki crater
- Puente Hills Fault
- Puertasaurus
- Puerto Yuerua Formation
- Pukyongosaurus
- Pulhamite
- Pull apart basin
- Pultusk (meteorite)
- Pumice
- Pumice raft
- Purbeck Group
- Purbeck Limestone Formation
- Purbeck Monocline
- Pure shear
- Purgatorius
- Purpurite
- Purvis Glacier
- Pycnodus
- Pycnonemosaurus
- Pygmy Mammoth
- Pyotr Nikolayevich Kropotkin
- Pyrargyrite
- Pyrite
- Pyrochlore
- Pyroraptor
- Pyrotheria
- Pyrotheriidae
- Pyrotherium
- Pyroxene
- Pyroxferroite
- Pyroxmangite
- Pyrrhotite
- Pääkkönenite
- QFL diagram
- Qagannur Formation
- Qigu Formation
- Qingshan Formation
- Qinlingosaurus
- Quaesitosaurus
- QuakeFinder
- QuakeSat
- Quake (natural phenomenon)
- Quantou Formation
- Quarry
- Quarterly Journal of the RAS
- Quarterly Journal of the Royal Astronomical Society
- Quarternary
- Quartz
- Quartz arenite
- Quartz latite
- Quartz monzonite
- Quartzite
- Quaternary
- Quaternary Geochronology
- Quaternary extinction event
- Quaternary geology
- Quaternary science
- Quebrada del Barro Formation
- Queen Charlotte Basin
- Queen Charlotte Fault
- Queen Charlotte Triple Junction
- Queenston Delta
- Quenstedtite
- Querandiornis
- Quercypsitta
- Quiba Formation
- Quicksand
- Quintinite
- Quiriquina Formation
- R. A. F. Penrose, Jr.
- R. S. Lull
- Rachitrema
- Radiocarbon dating
- Radiolarite
- Radiometric dating
- Radula
- Rae craton
- Ragozinka crater
- Rain-out model
- Rainbow Springs
- Rainbow Springs State Park
- Raindrop impressions
- Rake (geology)
- Ralph Molnar
- Ramapo Fault
- Rameauite
- Ramositidae
- Randa rockslides
- Randolph Kirkpatrick
- Rangea
- Rangeomorph
- Rangeomorpha
- Rapakivi granite
- Rapanui Rock
- Rapator
- Raphael Pumpelly
- Rare earth element
- Raritan Formation
- Raspite
- Ratchasimasaurus
- Raton Basin
- Rauk
- Raul–Yuri Georgievich Ervier
- Raven Ridge
- Ravenscrag Formation
- Ravine
- Raymond Fault
- Raymond Jeanloz
- Raymond R. Rogers
- Raymondoceratinae
- Raymundo Punongbayan
- Rayoso Formation
- Rayososaurus
- Reactions to the 2008 Sichuan earthquake
- Realgar
- Rebbachisaurus
- Recrystallization (geology)
- Red Butte
- Red Gulch Dinosaur Tracksite
- Red Hills Region
- Red Mediterranean soil
- Red Mountain (Birmingham)
- Red Mountain Expressway Cut
- Red River Formation
- Red Wing crater
- Red hill (salt making)
- Redknife Formation
- Reed Flute Cave
- Reedsville Formation
- Reef knoll
- Reference ellipsoid
- Reflection seismology
- Reginald Aldworth Daly
- Reginald Hooley
- Region of freshwater influence
- Regnellites
- Regnosaurus
- Regurgitalith
- Rejuvenation (river)
- Relative dating
- Relict
- Remingtonocetus
- Remote sensing (archaeology)
- Renierite
- Rennell Island
- René Lavocat
- Repository for radioactive waste Morsleben
- Restite
- Resurgent dome
- Reticuloceratidae
- Retrogradation
- Reuchenette Formation
- Reuverian
- Reviews of Geophysics
- Reynir Bödvarsson
- Rhabdodon
- Rhabdodontidae
- Rhacolepis
- Rhadinosaurus
- Rhaetian
- Rhaetic Beds
- Rharbichthys
- Rheic Ocean
- Rheid
- Rheniite
- Rhenohercynian Zone
- Rhine rift
- Rhinosauriscus
- Rhinotitan
- Rhodite
- Rhodolith
- Rhodonite
- Rhodplumsite
- Rhombodus
- Rhopalodon
- Rhuddanian
- Rhyacian
- Rhymmoceratidae
- Rhynchaeites
- Rhynchippus
- Rhynchodercetis
- Rhyncholepis
- Rhynia
- Rhynie chert
- Rhyodacite
- Rhyolite
- Rhythmite
- Rhytidosteidae
- Rhätsandstein
- Riachão Ring
- Rice Northwest Museum of Rocks and Minerals
- Richard C. Aster
- Richard Dixon Oldham
- Richard Edmonds (scientist)
- Richard Funkhouser
- Richards equation
- Richat Structure
- Ridge
- Ridge push
- Riebeckite
- Rift
- Rift lake
- Rift valley
- Rim (craters)
- Rimella fissurella
- Rimstone
- Ring dike
- Ring of Gullion AONB
- Ringbone Formation
- Ringing rocks
- Rio Cuarto craters
- Riojasauridae
- Riojasaurus
- Ripley Formation
- Ripple marks
- Rippon Glacier
- Riprap
- Risting Glacier
- Ritchey Knob
- Ritland crater
- River
- River anticlines
- River bifurcation
- River channel migration
- River delta
- Rivera Plate
- Rivera Triple Junction
- Riverbluff Cave
- Roadian
- Roaldite
- Robert Alfred Cloyne Godwin-Austen
- Robert Etheridge
- Robert Hazen
- Robert Hunter (Encyclopædist)
- Robert John Lechmere Guppy
- Robert Kidston
- Robert M. Hirsch
- Robert Mallet
- Robert Norman
- Robert S. Dietz
- Roberto Mantovani
- Rocasaurus
- Roche moutonnée
- Rochechouart crater
- Rochester Rock Art Panel
- Rock (geology)
- Rock Elm Disturbance
- Rock Magnetism
- Rock cycle
- Rock formations in Greece
- Rock formations in Russia
- Rock formations in Slovakia
- Rock fragment
- Rock glacier
- Rock magnetism
- Rock mass classification
- Rock of Gibraltar
- Rock of Solutré
- Rock of Vergisson
- Rock physics
- Rockall Basin
- Rockfall
- Rocky Face Fault
- Rocky Mountain Association of Geologists
- Rocky Mountain Trench
- Rocky Mountains
- Rodeites
- Roderick Murchison
- Rodinia
- Rodolfo Amando Philippi
- Rodolfo Coria
- Rogen moraine
- Rollin D. Salisbury
- Romanche Trench
- Romeu Beltrão
- Ron Scarlett
- Rookery
- Roque Nublo
- Roscoelite
- Rose Canyon Fault
- Roselite
- Rosemanowes Quarry
- Ross Stein
- Rossiter W. Raymond
- Roter Kamm crater
- Rotmistrivka crater
- Rounding (sediment)
- Roundness (geology)
- Rouse number
- Routhierite
- Rowley Rag
- Roxbury Conglomerate
- Roxbury conglomerate
- Royal Astronomical Society
- Royal Geological Society of Cornwall
- Rozenite
- Rudolf Ruedemann
- Ruehleia
- Ruhpolding Formation
- Runaway climate change
- Rundle Group
- Rupelian
- Rupes
- Rusophycus
- Russellite
- Rutellum
- Rutgers Glacier
- Rutgers geological sciences
- Rutherfordine
- Ryan Glacier
- Ryedale Windypits
- Rynersonite
- Rytiodus
- Ryugase Group
- Ryukyu Trench
- Réunion hotspot
- Río de la Plata craton
- SANSA Space Science
- SIMBAD
- SKS waves
- SK 46
- SK 48
- SMR classification
- SPIN bibliographic database
- STS 14
- STS 71
- SWEAT (hypothesis)
- S P Crater
- Saarijärvi crater
- Sabatierite
- Sabieite
- Sabinaite
- Sabkha
- Sables de Breze
- Sables de Cherre
- Sables du Lussant
- Sables et Gres a Trigonia gibbosa
- Sables vert de l'Albien Formation
- Safe Harbor Dam
- Safflorite
- Sag (geology)
- Sagenocrinites
- Sagisma
- Sahaliyania
- Saichania
- Sailing stones
- Saint Anthony Falls Laboratory
- Saint David's Buried Gorge
- Saint Lawrence rift system
- Saint Martin crater
- Sakmarian
- Salar de Uyuni
- Saleeite
- Saline evaporites
- Salomon Glacier
- Salt dome
- Salt dome Gorleben
- Salt glacier
- Salt marsh
- Salt pan (geology)
- Salt tectonics
- Salt tide
- Saltrio Formation
- Salzburgite
- Samad (crater)
- Samarskite-(Y)
- Sampleite
- Samsonite (mineral)
- Samuel Allport
- Samuel Beckles
- Samuel Calvin (geologist)
- Samuel Hibbert-Ware
- Samuel Kneeland (naturalist)
- Samuel Pickworth Woodward
- Samuelsonite
- San Andreas Fault
- San Benedicto Island
- San Bernardino Valley
- San Carlos Formation
- San Diego Formation
- San Gabriel Fault
- San Gregorio Fault
- San Jacinto Fault Zone
- San Joaquin Fault
- San Juan volcanic field
- Sanchusaurus
- Sand
- Sand Wells Formation
- Sand sheet
- Sand volcano
- Sandalodus
- Sandfall
- Sandplain
- Sandstone
- Sangarskaya Svita
- Sangiran 2
- Sangonghesaurus
- Sangping Formation
- Sanidine
- Sanpasaurus
- Santa Clara Volcano
- Santa Clara valley aquifer
- Santa Fe impact structure
- Santa Maria Formation
- Santa Rosa Formation
- Santana Formation
- Santanaraptor
- Santite
- Santonian
- Sanukitoid
- Sao Francisco craton
- Sao Khua Formation
- Saponite
- Sapropel
- Sarabauite
- Sarcolestes
- Sarcoprion
- Sarcosaurus
- Sarkastodon
- Sarmatian craton
- Sarsen
- Saskatchewan Group
- Sassolite
- Satellite geodesy
- Sauk sequence
- Saurichthys
- Saurophaganax
- Sauroplites
- Sauropodus
- Saurorhamphus
- Savage Mountain
- Sawatch Uplift
- Sawmill Geyser
- Saxothuringian Zone
- Sayh al Uhaymir 169
- Sazavis
- Scalabrinitherium
- Scapanorhynchus
- Scaphites
- Scarrittia
- Scelidotherium
- Schacht Asse II
- Schacht Konrad
- Scheelite
- Scherr Formation
- Schiehallion experiment
- Schist
- Schistocerataceae
- Schistoceratidae
- Schizorhiza
- Schmidt Glacier
- Schmidt hammer
- Schmiederite
- Schochia
- Schoepite
- Schooler Creek Group
- Schrader Glacier
- Schreibersite
- Schreyerite
- Schröckingerite
- Schuylkill Gap
- Schwertmannite
- Schäferite
- Scientific drilling
- Sclavia craton
- Sclerometer
- Sclerorhynchus
- Sclerotic ring
- Scolecodont
- Scollard Formation
- Scorodite
- Scorzalite
- Scotia Plate
- Scree
- Scripps Canyon
- Scriptural geologist
- Scrutinyite
- Scutellosaurus
- Sea-level curve
- Sea cave
- Sea level
- Sea level equation
- Seafloor massive sulfide deposits
- Seafloor spreading
- Seattle Fault
- Sebakwe craton
- Sebayashi Formation
- Secernosaurus
- Sectility
- Section restoration
- Secunduri Formation
- Sedcad
- Sediment
- Sediment gravity flow
- Sediment transport
- Sediment trap (geology)
- Sedimentary basin
- Sedimentary basin analysis
- Sedimentary budget
- Sedimentary depositional environment
- Sedimentary deposits
- Sedimentary exhalative deposits
- Sedimentary organic matter
- Sedimentary rock
- Sedimentary structures
- Sedimentology
- Segelerite
- Seifertite
- Seismic anisotropy
- Seismic gap
- Seismic migration
- Seismic refraction
- Seismic scale
- Seismic shadowing
- Seismic source
- Seismic tomography
- Seismicity of the Sanriku coast
- Seismite
- Seismo-electromagnetics
- Seismogram
- Seismology
- Sekaninaite
- Sekiya Seikei
- Selandian
- Selenide minerals
- Selenopeltis
- Sellosaurus
- Selma Group
- Selwyn Range (Australia)
- Semionotiformes
- Semionotus
- Sengoku Formation
- Septentrional-Oriente fault zone
- Sequence (geology)
- Sequence stratigraphy
- Sergei Kurzanov
- Series (stratigraphy)
- Serpent Mound crater
- Serpentine group
- Serpentine soil
- Serpentinite
- Serpukhovian
- Serra Fault
- Serra da Cangalha
- Serranopsis
- Serravallian
- Sespe Formation
- Sespia
- Seven-Star Cave
- Seven Tubs Natural Area
- Severn Formation
- Sevier orogeny
- Sewardite
- Shadow zone
- Shale gas
- Shale gas in the United States
- Shamosaurus
- Shanag
- Shandite
- Shansitherium
- Shantungosaurus
- Shanyang Formation
- Shanyangosaurus
- Shaochilong
- Shar Teeg Beds
- Sharp's Hill Formation
- Shastoceras
- Shatsky Rise
- Shatter Cave
- Shatter cone
- Shaunavon Formation
- Shawangunk Formation
- Shear (geology)
- Shear wave splitting
- Shear zone
- Sheeted dyke complex
- Sheinwoodian
- Shellenberger Canyon Formation
- Shelly limestone
- Shendi Formation
- Shennongtherium
- Sherwood Sandstone Group
- Shestakovskaya Svita
- Shield (geology)
- Shield volcano
- Shields parameter
- Shinekhudag Svita
- Shingle beach
- Shishugou Formation
- Shiva Hypothesis
- Shiva crater
- Shixinggia
- Shoal
- Shock metamorphism
- Shocked quartz
- Shoemaker crater
- Shonkin Sag
- Shouchangoceratinae
- Shrink-swell capacity
- Shuang River Cave Group
- Shuanglong Cave
- Shuangmiaosaurus
- Shumarditaceae
- Shumarditidae
- Shunak crater
- Shungura Formation
- Shuttle Meadow Formation
- Shuttle Radar Topography Mission
- Sial
- Siamodon
- Siamosaurus
- Siamotyrannus
- Siberia (continent)
- Siberian Shelf
- Siberian Traps
- Siccar Point
- Sicilian Stage
- Sidcot Swallet
- Side-scan sonar
- Sideling
- Siderian
- Siderite
- Siderotil
- Sidney H. Haughton
- Siegenian
- Sierra Madera crater
- Sierra Negra (Galápagos)
- Sierra Nevada Batholith
- Sierra Perenchiza Formation
- Sifrhippus
- Sigismund Ernst Richard Krone
- Sigriswiler Rothorn
- Sikeston Ridge
- Sikhote-Alin meteorite
- Silcrete
- Silfra
- Silicate minerals
- Siliceous ooze
- Siliceous rock
- Silicon dioxide
- Siljan (lake)
- Sill (geology)
- Sill swarm
- Silt
- Silurian
- Silvabestius
- Silver Creek Fault
- Silver mining in Colorado
- Silver mining in Nevada
- Silver mining in the United States
- Silverpit crater
- Sima (geology)
- Simocyon
- Simpsonite
- Sincosite
- Sindbad (crater)
- Sinemurian
- Singing sand
- Sinkhole
- Sinkhole Dersios
- Sinoconodon
- Sinornis
- Sinornithoides
- Sinosaurus
- Sinotitinae
- Sinovenator
- Sinraptoridae
- Sinuiju Formation
- Sinuosity
- Sinusonasus
- Sioux Quartzite
- Sirius Passet
- Sisquoc Formation
- Sistema Ox Bel Ha
- Sivatherium
- Sixmilewater Fault
- Size Strength classification
- Skaergaard intrusion
- Skaergaardite
- Skania
- Skarn
- Skiddaw Slate
- Skolithos
- Skutterudite
- Slab (geology)
- Slab pull
- Slab suction
- Slab window
- Slaking (geology)
- Slate
- Slate Islands (Ontario)
- Slave Point Formation
- Slave craton
- Slide Mountain Ocean
- Slide Mountain Terrane
- Slimonia
- Slope-former
- Slope mining
- Slope stability
- Slot canyon
- Slow earthquake
- Slump (geology)
- Slyne-Erris Trough
- Small shelly fauna
- Small shelly fossil
- Smaltite
- Smartville Block
- Smilodon californicus
- Smilodontini
- Smithsonite
- Smoky Group
- Smoky Hill Chalk
- Snake Ridge Formation
- Snow cornice
- Snowball Earth
- Soapstone
- Soapstone Ridge
- Sobolev crater
- Sociedade Brasileira de Geologia
- Society for Sedimentary Geology
- Society hotspot
- Society of Economic Geologists
- Society of Exploration Geophysicists
- Soddyite
- Soil
- Soil liquefaction
- Soil science
- Sole markings
- Soledad Beds
- Solifluction
- Solnhofen Plattenkalk
- Solomon Sea Plate
- Solonchak
- Solonetz
- Solvus
- Somali Plate
- Somoholitaceae
- Somoholitidae
- Songlingornis
- Songzia
- Sonidosaurus
- Sonomia Terrane
- Sonorasaurus
- Sophiornithidae
- Sorbas basin
- Soroavisaurus australis
- Sorong Fault
- Sorting (sediment)
- Sossusvlei
- Source rock
- South American Plate
- South China (continent)
- South Downs
- South Florida rocklands
- South Tasman Rise
- Southern Alps (geology)
- Southerndown
- Sovanco Fracture Zone
- Spacecraft Planet Instrument C-matrix Events
- Sparagmite
- Spathobathis
- Specific storage
- Spectral acceleration
- Speeton Clay
- Speleogenesis
- Speleology
- Speleoseismite
- Speleothem
- Spenceley Glacier
- Spencer G. Lucas
- Sperrylite
- Sphaerocobaltite
- Sphenocephalus
- Sphenodiscus
- Spherical harmonics
- Spherocobaltite
- Spheroidal weathering
- Spider crater
- Spiegeleisen
- Spilite
- Spinostropheus
- Spiriferina
- Spirit River Formation
- Spirolegoceratidae
- Sporadoceratidae
- Sporadoceratinae
- Sporinite
- Spring (hydrology)
- Spurrite
- St. Genevieve marble
- St. Helena hotspot
- St. Louis Limestone
- St. Marks Formation
- St. Mary's Islands (Karnataka)
- St. Michael's Cave
- St. Peter Sandstone
- St Cuthbert's Swallet
- Stack (geology)
- Stacking velocity
- Stage (hydrology)
- Stage (stratigraphy)
- Stalactite
- Stalagmite
- Stanley Bowie
- Stannite
- Statenville Formation
- Statherian
- Station Stones
- Stauranderaster
- Staurolite
- Ste. Genevieve Limestone
- Steacyite
- Steamboat Springs, Nevada
- Steen River crater
- Stegolophodon
- Stegomastodon
- Stegosaurides
- Steinheim crater
- Stellerite
- Stem group
- Stemflow
- Stenaster
- Steneofiber
- Stenian
- Stenolaphyritidae
- Stenomylus
- Stenopelix
- Stephanite
- Stephanitidae
- Stephanoceras
- Stephen E. Haggerty
- Stephen Formation
- Stephen Hislop
- Stephenson Glacier
- Steppe mammoth
- Stereosaurus
- Sterling Hill Mining Museum
- Stibiopalladinite
- Stilleite
- Stillwater igneous complex
- Stillwaterite
- Stillwellite-(Ce)
- Stishovite
- Stockton Arch
- Stockton Formation
- Stockwork
- Stoddart Group
- Stoke Lane Slocker
- Stokesosaurus
- Stolzite
- Stone Forest
- Stonebarrow
- Stonewall Formation
- Stony Mountain Formation
- Stoping
- Storegga Slide
- Storey Glacier
- Stormberg Group
- Stormbergia
- Storrs L. Olson
- Straight Cliffs Formation
- Strand plain
- Strangways crater
- Stratigraphic column
- Stratigraphic section
- Stratigraphy
- Stratodus
- Stratospheric sulfate aerosols (geoengineering)
- Stratovolcano
- Stratum
- Stream
- Stream bed
- Stream capacity
- Stream power
- Strengite
- Strepsodiscus
- Streptospondylus
- Strewn field
- Striation (geology)
- Striatolamia
- Strike-slip tectonics
- Strike and dip
- Stromatoporoidea
- Strombolian eruption
- Stromeyerite
- Strontianite
- Structural basin
- Structural geology
- Structure of the Earth
- Strunius
- Stuart Olof Agrell
- Stuart Ross Taylor
- Studenitsite
- Studtite
- Sturzstrom
- Stylemys
- Stylinodon
- Stylolite
- Stylonurina
- Stützite
- Suavjärvi crater
- Subaerial
- Subantarctic
- Subaqueous fan
- Subaqueous volcano
- Subashi Formation
- Subcontinent
- Subduction
- Subglacial eruption
- Subglacial lake
- Subglacial volcano
- Submarine canyon
- Submarine earthquake
- Submarine eruption
- Submarine groundwater discharge
- Submarine landslide
- Submarine volcano
- Submerged continent
- Subsidence crater
- Subsolvus
- Substorm
- Succession (geology)
- Succinodon
- Suchosaurus
- Sudbury Basin
- Sudbury Igneous Complex
- Sudeticeratidae
- Sue Hendrickson
- Sue Tyler Friedman Medal
- Suessite
- Suevite
- Suffosion
- Sugilite
- Sugiyamasaurus
- Suining Formation
- Sulaiman Mountains
- Sulaimanisaurus
- Sulcus (geology)
- Sulfarsenide mineral
- Sulfate minerals
- Sulfide minerals
- Sulfosalt minerals
- Sulphur Spring
- Summerville Formation
- Summit (topography)
- Summit Creek Formation
- Sunda Arc
- Sunda Plate
- Sunda megathrust
- Sundance Formation
- Sundance Sea
- Sundays River Formation
- Sunjiawan Formation
- Sunstone (medieval)
- Suntar Series
- Supercontinent
- Supercontinent cycle
- Superficial deposits
- Supergene (geology)
- Superior Shoal
- Superior craton
- Superocean
- Supersequence
- Supervolcano
- Supracrustal
- Supracrustal rock
- Surenitidae
- Surface exposure dating
- Surface water
- Surficial aquifer
- Suspended load
- Sussex Marble
- Sutter's Mill meteorite
- Suture (geology)
- Suvasvesi
- Suwannee Limestone
- Suzhousaurus
- Svanbergite
- Swartpuntia
- Swazian
- Sweet Home Mine
- Sweet crude oil
- Sweetite
- Swift Creek Landslide
- Swildon's Hole
- Switzerite
- Sydney Basin
- Syed Mahmood Naqvi
- Sygambritinae
- Sylacauga (meteorite)
- Sylvanite
- Symplectite
- Syncline
- Syndyoceras
- Syneclise
- Syneresis cracks
- Synthetic seismogram
- Synthetoceras
- Syrian camel
- Syrt
- System (stratigraphy)
- Szechuanoraptor
- Szechuanosaurus
- Sânpetru Formation
- Sääksjärvi
- Söderfjärden
- TM 1517
- Tabenbulakian
- Table Mountain Sandstone (Geological Formation)
- Tabulata
- Tabun-Khara-Obo crater
- Taconic Mountains
- Taconic orogeny
- Taconite
- Taeniodont
- Taenite
- Tahora Formation
- Takli Formation
- Talc carbonate
- Talemzane crater
- Talnakhite
- Tamala limestone
- Tamarugite
- Tamayama Formation
- Tambach Formation
- Tamiami Formation
- Tangshan hot springs
- Tangshang Formation
- Tangvayosaurus
- Tanius
- Tannersville Cranberry Bog
- Tanohata Formation
- Tantalite
- Tantite
- Tanya Atwater
- Tapashanitidae
- Tapinocephalus Assemblage Zone
- Tapiolite
- Tar pit
- Tara Mine
- Taranakite
- Tarascosaurus
- Tarchia
- TaskForceMajella
- Tasmanite
- Tatisaurus
- Taveirosaurus
- Taynton Limestone Formation
- Tazukawa Formation
- Te Pou Hawaiki
- Tea table
- Tealliocaris
- Teallite
- Tecovas Formation
- Tectonic subsidence
- Tectonic uplift
- Tectonics
- Tectonics of the Tian Shan
- Tectonite
- Tectonophysics
- Tectonophysics (journal)
- Tectonostratigraphy
- Tees-Exe line
- Tegana Formation
- Tehuelchesaurus
- Teilhardina magnoliana
- Teinurosaurus
- Tejas sequence
- Tektite
- Telalginite
- Telegeodynamics
- Telegraph Creek Formation
- Teleoceras
- Teleseism
- Teletsunami
- Telicomys
- Tellus B
- Telmatornis
- Telmatosaurus
- Telychian
- Temagami Magnetic Anomaly
- Temagami greenstone belt
- Temagamite
- Tempestite
- Tempo – Sixmilecross Fault
- Tenacity (mineralogy)
- Tendaguria
- Tendaguru Formation
- Tenebrescence
- Tenglong Cave
- Tenham (meteorite)
- Tennantite
- Tennessee marble
- Tenontosaurus
- Tenoumer crater
- Tensiometer (soil science)
- Tension (geology)
- Tentaculites
- Tentaculites oswegoensis
- Tephrochronology
- Tepui
- Tera Beds
- Terataspis
- Terceira Rift
- Terebrirostra
- Teresa Maryańska
- Terminal moraine
- Ternovka crater
- Terra rossa (soil)
- Terrace (geology)
- Terracette
- Terrane
- Tesla Fault
- Tessellated pavement
- Tetcho Formation
- Tethyan Trench
- Tethys Ocean
- Tetraceratops
- Tetrahedrite
- Teviornis
- Texture (geology)
- Teyuwasu
- Thalassocerataceae
- Thalassoceratidae
- Thalassocnus
- Thalassoleon
- Thanetian
- Thaumaptilon
- Thaumasite
- The Berkshires
- The Great Devonian Controversy
- The Journal of Geology
- The Murchison Fund
- The Silver Spade
- The Spittles
- The Structure and Distribution of Coral Reefs
- The Undercliff
- The Volcano (British Columbia)
- Thecocoelurus
- Thecospondylus
- Theiophytalia
- Thelodonti
- Thelodus
- Thenardite
- Theodor Wolf
- Theoretical gravity
- Theoretical planetology
- Theosodon
- Thermochronology
- Thermokarst
- Thermoluminescence dating
- Thermoremanent magnetization
- Thick-skinned deformation
- Thin-skinned deformation
- Thin section
- Thiviers-Payzac Unit
- Thoatherium
- Tholeiitic magma series
- Tholus
- Thomas A. Greene
- Thomas Chrowder Chamberlin
- Thomas Oldham
- Thomas R. Holtz, Jr.
- Thomasclarkite
- Thomashuxleya
- Thomsonite
- Thorianite
- Thorite
- Thortveitite
- Thotobolosaurus
- Three Forks Group
- Thrissops
- Throughflow
- Thrupe Lane Swallet
- Thrust fault
- Thrust tectonics
- Thulean Plateau
- Thumbnail (cliff)
- Thunderegg
- Thuringite
- Thursius
- Thylacosmilus
- Tianchisaurus
- Tiaojishan Formation
- Tibet
- Tichosteus
- Tidal bundle
- Tidal marsh
- Tielt Formation
- Tiemannite
- Tienshanite
- Tienshanosaurus
- Tierra Redonda Mountain
- Tiki Formation
- Tilgate Formation
- Tilougguit Formation
- Tim Patterson
- Time range of Hexanchiformes species
- Timeline of evolutionary history of life
- Timeline of geology
- Timeline of the development of tectonophysics
- Timeline of the far future
- Timeline of the geologic history of the United States
- Timimus
- Tin Bider crater
- Tinaksite
- Tingamarra
- Tiouraren Formation
- Tisza Plate
- Titanite
- Titanohyrax
- Titanoides
- Titanosaurus
- Titanotylopus
- Titanowodginite
- Tithonian
- Toarcian
- Toarcian turnover
- Tobermorite
- Tochisaurus
- Tokosaurus
- Tollmann's hypothetical bolide
- Tolypelepidida
- Tom Segalstad
- Tommotia
- Tonalite-Trondhjemite-Granodiorite
- Tonga Plate
- Tonga Trench
- Tonian
- Tonoloway Formation
- Tonouchisaurus
- Tookoonooka crater
- Toolebuc Formation
- Tor Ørvig
- Torbanite
- Torbernite
- Torlesse Greywacke
- Tornieria
- Tornoceratidae
- Tornoceratina
- Tornoceratinae
- Tornoceratoidea
- Toronto Magnetic and Meteorological Observatory
- Torotix
- Torreya Formation
- Torridonian
- Tortonian
- Totternhoe Stone
- Touchet Formation
- Tourmaline
- Tournaisian
- Toutunhe Formation
- Tow Valley Fault
- Toxicity characteristic leaching procedure
- Toxodon
- Toxodontidae
- Trace element
- Trace fossil
- Traces of Catastrophe
- Trackway
- Trafalgar Moraine
- Tranquillityite
- Trans-Hudson orogeny
- Transform boundary
- Transform fault
- Transition zone (Earth)
- Transportation (sediment)
- Transpression
- Transtension
- Transvaal Basin
- Trap rock
- Traprock mountain
- Travertine
- Trefawr Track
- Tremacebus
- Tremadocian
- Tremataspis
- Tremolite
- Tremp Formation
- Tres Hermanos Formation
- Trevorite
- Tri-state water dispute
- Triassic
- Triassic–Jurassic extinction event
- Tribrachidium
- Trichinopoly Group
- Trichophycus pedum
- Triconodonta
- Trigodon
- Trigoides
- Trigonias
- Trigonosaurus
- Trigonostylops
- Triisodontidae
- Trilobite zone
- Trimble Knob
- Trimerophytopsida
- Trimucrodon
- Trinil 2
- Trinil tiger
- Trinity Formation
- Triple junction
- Triplite
- Triploidite
- Tripod Rock
- Tristan hotspot
- Tristychius
- Trituberculata
- Troctolite
- Trogosus
- Troilite
- Trona
- Trondhjemite
- Tropaeum
- Tropic Shale Formation
- Tropical zones
- Tropidaster
- Tropidostoma Assemblage Zone
- Troposphere
- Trossingen Formation
- Trou du Diable
- Trough (geology)
- Trout River Formation
- True polar wander
- Truncated spur
- Tsaagan
- Tsagaantsav Svita
- Tsagantegia
- Tsintaosaurus
- Tsuchikurasaurus
- Tsumcorite
- Tsumebite
- Tsunami
- Tsunami warning system
- Tswaing crater
- Tuchengzi Formation
- Tufa
- Tuff
- Tuffeau stone
- Tuffite
- Tugulusaurus
- Tujingzi Formation
- Tullimonstrum
- Tumblagooda sandstone
- Tummalapalle uranium mine
- Tungsten ore
- Tungstite
- Tunguska event
- Tunnel valley
- Tuperssuatsiaite
- Turanoceratops
- Turbidite
- Turbidity current
- Turginskaya Svita
- Turiasaurus
- Turkana Grits
- Turney Ranch Formation
- Turonian
- Turquoise
- Turquoise Pool
- Turrilitidae
- Turrilitoidea
- Tuscarora Formation
- Tusionite
- Tuya
- Tvären
- Tweed Volcano
- Twin Buttes
- Twin Mountains Formation
- Tylocephale
- Tylocephalonyx
- Tyndall stone
- Type locality (geology)
- Types of volcanic eruptions
- Typotheria
- Tyrolite
- Tyrrell Sea
- Tyrrellite
- Tyrrhenian (stage)
- Tyto gigantea
- Tyto pollens
- Tytoona Cave
- Tytthostonyx
- Uarbryichthys
- Uberaba Formation
- Udachnaya pipe
- Uhligella
- Uhligia
- Uhligites
- Uintatheriidae
- Uintatherium
- Ukrainian Shield
- Ulansuhai Formation
- Ullapool bolide impact
- Ulrichite
- Ultra-high-temperature metamorphism
- Ultramafic rock
- Ulysses Sherman Grant
- Umangite
- Umbetoceras
- Umiaites
- Unakite
- Unaweep Canyon
- Unconformity
- Underground mining (soft rock)
- Underplating
- Undulose extinction
- Unduruh Formation
- Unidade Arranho
- Unidade Castelhanos Formation
- Uniformitarianism
- Unipeltoceras
- United States Geological Survey
- Unquillosaurus
- Unterwarnow
- Upalite
- Upheaval Dome
- Upper Dharmaram Formation
- Upper Elliot Formation
- Upper Hirst
- Upper Karoo Group
- Upper Karroo Sandstone Formation
- Upper Maleri Formation
- Upper Silesian Coal Basin
- Upper plane bed
- Upward continuation
- Uquian
- Ur (continent)
- Ural Ocean
- Uralian orogenic belt
- Uralian orogeny
- Uraninite
- Uranium-lead dating
- Uranium mining in Colorado
- Uranium mining in Utah
- Uranium mining in Wyoming
- Uranium mining in the United States
- Uranium ore
- Uranocircite
- Uranophane
- Uranopilite
- Ureilite
- Ust’ Pinega Formation
- Utica Shale
- Uzbekbaatar
- VAN method
- Vaalbara
- Vaasa granite
- Vaesite
- Vahsel Glacier
- Valais Ocean
- Valanginian
- Valdoraptor
- Valdosaurus
- Vale of Clwyd
- Valenticarbo
- Valentine Ball
- Valle de Angeles Redbeds
- Vallesian
- Valley
- Valtos Sandstone Formation
- Vanadinite
- Vanadiocarpholite
- Vanguard Formation
- Vantasselite
- Vanuralite
- Vaqueros Formation
- Vargeão Dome
- Variraptor
- Variscan orogeny
- Varve
- Vauxite
- Veatchite
- Vectis Formation
- Veevers crater
- Vega Formation
- Vegavis
- Vegetation and slope stability
- Veiki moraine
- Vein (geology)
- Velafrons
- Velocipes
- Velocisaurus
- Vema Fracture Zone
- Venaticosuchus
- Vendia
- Venenosaurus
- Vepriai crater
- Verd antique
- Vermiculite
- Vermillion River Formation
- Verneshot
- Vertebrate paleontology
- Vertical displacement
- Vertical seismic profile
- Vesicular texture
- Vestfoldraet
- Veterupristisaurus
- Vetulicolidae
- Vicentino Prestes de Almeida
- Vichada Structure
- Victor Efimovich Khain
- Victor Goldschmidt
- Victoria Island structure
- Viewfield crater
- Viking Formation
- Villar del Arzobispo Formation
- Villiaumite
- Villigen Formation
- Vincent Courtillot
- Vine–Matthews–Morley hypothesis
- Vinita Formation
- Violarite
- Virgin River Gorge
- Viscous remanent magnetization
- Vista Alegre crater
- Visual MODFLOW
- Viséan
- Vitakridrinda
- Vitim event
- Vitrinite
- Vivianite
- Vladimirite
- Vlasovite
- Volaticotherium
- Volcanic arc
- Volcanic ash
- Volcanic belt
- Volcanic hazards
- Volcanic plateau
- Volcanic rock
- Volcanism
- Volcanism of Canada
- Volcanism of Iceland
- Volcanism of Indonesia
- Volcanism of Italy
- Volcanism of New Zealand
- Volcanism on Io
- Volcanism on Mars
- Volcanism on Venus
- Volcano
- Volcano tectonic earthquake
- Volcanoes of east-central Baja California
- Volcanology
- Volkheimeria
- Volutospina
- Vorona
- Voulismeno aloni
- Vredefort crater
- Vug
- Vulcan structure
- Vulcanian eruption
- Vulcanodon
- Vulcanodontidae
- W. G. Ernst
- W. Jason Morgan
- W. Timothy Liu
- WDC DML 001
- Wabamun Formation
- Wabar craters
- Wackestone
- Wadati–Benioff zone
- Wadi Milk Formation
- Wadsleyite
- Wagnerite
- Wahweap Formation
- Waimanu
- Wairakite
- Wairarapa Fault
- Wairau Fault
- Wairere Boulders
- Wakabayashilite
- Wakefieldite
- Wakinosaurus
- Wakulla Springs
- Wal-Mart camel
- Walcott-Rust quarry
- Walfordite
- Walgettosuchus
- Walkersaurus
- Walkomiella
- Wall rock
- Walliserops
- Walter Alvarez
- Walter C. Pitman, III
- Walter M. Elsasser
- Walvis Ridge
- Wangshi Series
- Wann Langston, Jr.
- Wapiti Formation
- Wapiti Group
- Wardite
- Warrior Formation
- Warwickite
- Wash load
- Wassonite
- Waste Isolation Pilot Plant
- Watchung Outliers
- Water contact
- Water cycle
- Water gap
- Water management
- Water on terrestrial planets
- Water table
- Waterfall
- Watrous Formation
- Watts Point volcanic centre
- Wave-cut platform
- Wave-formed ripple
- Wave pounding
- Wax Lake
- Way up structure
- Wayan Formation
- Weald Basin
- Weald Clay
- Wealden Supergroup
- Weald–Artois Anticline
- Weathering
- Webb Hill
- Weddell Plain
- Weeki Wachee Springs
- Weeksite
- Well log
- Wellington Fault
- Wellnhoferia
- Wells Creek crater
- Weloganite
- Welsh Borderland Fault System
- Wem-Bridgemere-Red Rock Fault System
- Wenlock Series lagerstätte
- Wenlock epoch
- Wessex Formation
- West African craton
- West Antarctic Rift
- West Hawk crater
- West Scotia Basin
- West Triplet Geyser
- Westbury Formation
- Western Canadian Sedimentary Basin
- Western Ethiopian Shield
- Western Interior Seaway
- Westgarth Forster
- Westmorland Geological Society
- Weston Observatory (Boston College)
- Wet gas
- Wetterstein limestone
- Wetumpka crater
- Wheeler Shale
- Whewellite
- Whin Sill
- Whinstone
- Whipple Mountains
- Whitby Mudstone Formation
- White River Ash
- White Wolf Fault
- Whitedamp
- Whiteite
- Whiterock Stage
- Whiteschist
- Whitlockite
- Whittier Fault
- Widmerpool Gulf
- Wilkes Land crater
- William Alexander Deer
- William Barton Rogers
- William Berryman Scott
- William Borlase
- William Boyd Dawkins
- William Buckland
- William E. Dietrich
- William Francis Ainsworth
- William Gregor
- William H. Schlesinger
- William J. Sanders
- William James Kennedy
- William Johnson Sollas
- William Morris Davis
- William Niven
- William Pengelly
- William Phipps Blake
- William Sansom Vaux
- William Smith (geologist)
- William Whitehead Watts
- William Williams Mather
- Williams Fork Formation
- Williams Formation
- Williston Basin
- Willow Creek Formation
- Wills Creek Formation
- Wind River Basin
- Windermere Supergroup
- Windermere group
- Window (geology)
- Winspit
- Winston Glacier
- Winterburn Group
- Winton Formation
- Wisconsin glaciation
- Wissahickon Formation
- Wissahickon schist
- Witaaspis
- Witch's Finger
- Witherite
- Witwatersrand Basin
- Witwatia
- Wiwaxia
- Wodginite
- Wolf Island
- Wolf von Engelhardt
- Wolfe Creek Crater
- Wolfenstein (rock)
- Wolfgang Franz von Kobell
- Wolframite
- Wolfville Formation
- Women in geology
- Wonthaggi Formation
- Woodbend Group
- Woodbine Formation
- Woodbury Formation
- Woodleigh crater
- Woodville Karst Plain
- Woodville Karst Plain Project
- Woodward's Eagle
- Wordian
- World Magnetic Model
- Woyie River (Diamond)
- Wrangell Volcanic Field
- Wucaiwan Formation
- Wuchiapingian
- Wuerhosaurus
- Wulagasaurus
- Wulungo Formation
- Wunsiedel Marble
- Wurtzite
- Wyartite
- Wyleyia
- Wyoming craton
- Wyomingraptor
- Wyville-Thomson Ridge
- Wüstite
- Xalnene Tuff footprints
- Xenocyon lycaonoides
- Xenolith
- Xenomorph (geology)
- Xenoposeidon
- Xenosmilus
- Xenotarsosaurus
- Xenotime
- Xenusion
- Xert Formation
- Xiagou Formation
- Xianren Cave
- Xianshanosaurus
- Xiaogou Formation
- Xiaosaurus
- Xiaoyan Formation
- Xidazoon
- Xifengite
- Xilingolite
- Xinjiangovenator
- Xinpongnaobao Formation
- Xiongguanlong
- Xixianykus
- Xixiasaurus
- Xuanhanosaurus
- Xuanhuaceratops
- Xue Feng
- Xueyu Cave
- Yacoraite Formation
- Yamaceratops
- Yamato 691
- Yamato 791197
- Yandangornis
- Yandusaurus
- Yantanglestes
- Yap Trench
- Yarala
- Yarnemia
- Yarrabubba crater
- Yaverlandia
- Yellowknife greenstone belt
- Yellowstone Caldera
- Yellowstone National Park
- Yellowstone hotspot
- Yesnaby Sandstone Group
- Yevgeny Fyodorov
- Yevgraf Fyodorov
- Yezo Group
- Yibinosaurus
- Yijinholuo Formation
- Yilgarn Craton
- Yilong Cave
- Yimenosaurus
- Yingshanosaurus
- Yixian Formation
- Yixianornis
- Yixianosaurus
- Yoden Village Quarry
- Yoldia Sea
- Yonaguni Monument
- Yongantun Formation
- Yoredale Series
- Yorgia
- Yorktown Formation
- Younger Dryas impact hypothesis
- Ypresian
- Yttrialite
- Yttrocerite
- Yuanmousaurus
- Yuanpu Formation
- Yukon-Tanana Terrane
- Yuksporite
- Yule Marble
- Yuliangze Formation
- Yungavolucris
- Yunnanosaurus
- Yunxiansaurus
- Yuri Alexandrovich Popov
- ZTR index
- Zabuyelite
- Zaccagnaite
- Zagros fold and thrust belt
- Zairite
- Zajacite-(Ce)
- Zalambdalestes
- Zalmoxes
- Zanabazar (dinosaur)
- Zanazziite
- Zanclean
- Zanclean flood
- Zanclodon
- Zanclodonmergel
- Zaniolepis
- Zapadnaya crater
- Zapalasaurus
- Zatomus
- Zealandia (continent)
- Zechstein
- Zedekiah's Cave
- Zeleny Gai crater
- Zeltornis
- Zemannite
- Zenion
- Zenopsis
- Zeolite facies
- Zephyrosaurus
- Zeunerite
- Zhamanshin crater
- Zhejiangosaurus
- Zhemchug Canyon
- Zhemchuzhnikovite
- Zhenzhuchong Formation
- Zhezhunchong Formation
- Zhidan Group
- Zhijin Cave
- Zhongdong, Ziyun County
- Zhongyuansaurus
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