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Chronostratigraphy of Illinois
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v
t
e
Chronostratigraphy
of
Illinois
Ph
Cz
Q
Holocene
Glacial alluvium, drift, and loess
Pleistocene
Embayment Megagroup
Mounds Gravel
Grover Gravel
N
Pliocene
Embayment Megagroup
Mounds Gravel
Grover Gravel
Pe
Eocene
Embayment Megagroup
Wilcox Formation
Claiborne Formation
Paleocene
Embayment Megagroup
Porters Creek Formation
Clayton Formation
Mz
K
Upper
Maastrichtian
Embayment Megagroup
Owl Creek Formation
McNairy Formation
Baylis Formation
Campanian
Embayment Megagroup
Post Creek Formation
Baylis Formation
Pz
C
⁋
Kasimovian
McLeansboro Group
Bond Formation
Mattoon Formation
Patoka Formation
Shelburn Formation
Moscovian
Carbondale Group
Bashkirian
Raccoon Creek Group
Brazil Formation
Caseyville Formation
Mansfield Formation
Tradewater Formation
Staunton Formation
M
Serpukhovian
Pope Mega Group
Grove Church
Kinkaid Limestone
Dagonia Sandstone
Clore Formation
Palestine Sandstone
Menard Limestone
Waltersburg Formation
Vianna Formation
Tar Springs Sandstone
Viséan
Pope Mega Group
Glen Dean Limestone
Hardinsburg Sandstone
Haney Limestone
Fraileys Formation
Beech Creek Limestone
Cypress Sandstone
Ridenhower Formation
Bethel Sandstone
Downeys Bluff Limestone
Yankeetown Limestone
Renault Limestone
Aux Vases Sandstone
Ste. Genevieve Limestone
Golconda Formation
Paint Creek Formation
Paoli Formation
Tournaisian
Borden Siltstone
Chouteau Limestone
Fern Glen Formation
Meppen Limestone
New Albany Formation
Springville Shale
Borden Siltstone
Burlington Limestone
Fort Payne Formation
Keokuk Limestone
Salem Limestone
St. Louis Limestone
Ullin Limestone
Warsaw Formation
D
Upper
Famennian
New Albany Shale
Frasnian
New Albany Shale
Middle
Givetian
Cedar Valley Limestone
St. Laurent Formation
Eifelian
Grand Tower Limestone
Wapsinicon Limestone
Detroit River Formation
Muscatatuck Group
North Vernon Limestone
Jeffersonville Limestone
Lower
Emsian
New Harmony Group
Clear Creek Chert
Clear Creek Formation
Pragian
New Harmony Group
Backbone Limestone
Hunton Megagroup
Backbone Limestone
Grassy Knob Chert
Bailey Limestone
S
Ludlow
Ludfordian
Hunton Megagroup
Moccasin Springs Formation
Racine Dolomite
Gorstian
Hunton Megagroup
Moccasin Springs Formation
Racine Dolomite
Wenlock
Homerian
Sugar Run Dolomite
Sheinwoodian
Hunton Megagroup
Joliet Dolomite
St. Clair Limestone
Marcus Dolomite
Llandovery
Telychian
Hunton Megagroup
Sexton Creek Limestone
Marcus Dolomite
Aeronian
Hunton Megagroup
Sexton Creek Limestone
Rhuddanian
Bowling Green Dolomite
Brainard Shale
Fort Atkinson Limestone
Neda Formation
Blanding Dolomite
Hunton Megagroup
Kankakee Dolomite
Mosalem Formation
Sweeney Dolomite
Tete des Morts Dolomite
O
Upper
Hirnantian
Leemon Formation
Sandbian
St. Peter Sandstone
Cape Limestone
Decorah Formation
Dubuque Formation
Dunleith Formation
Glenwood Formation
Grand Detour Formation
Joachim Dolomite
Kimmswick Limestone
Maquoketa Formation
Mifflin Formation
Nachusa Formation
Quimbys Mill Formation
Scales Shale
Wise Lake Formation
Middle
Darriwilian
Dutchtown Limestone
St. Peter Sandstone
Everton Formation
Pecatonica Formation
Plattin Limestone
Lower
Tremadocian
New Richmond Sandstone
Oneota Dolomite
Shakopee Dolomite
Є
Bonneterre Formation
Munising Group
Davis Formation
Franconia Formation
Ironton Sandstone
Galesville Sandstone
Eau Claire Formation
Potosi Dolomite
Derby-Doerun Formation
Eminence Dolomite
Jordan Sandstone
Mt. Simon Sandstone