Template:Chronostratigraphy of Illinois

Chronostratigraphy of Illinois

Holocene	Glacial alluvium, drift, and loess
Pleistocene	Embayment Megagroup Mounds Gravel Grover Gravel

Pliocene	Embayment Megagroup Mounds Gravel Grover Gravel

Eocene	Embayment Megagroup Wilcox Formation Claiborne Formation
Paleocene	Embayment Megagroup Porters Creek Formation Clayton Formation

Maastrichtian	Embayment Megagroup Owl Creek Formation McNairy Formation Baylis Formation
Campanian	Embayment Megagroup Post Creek Formation Baylis Formation

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

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

Famennian	New Albany Shale
Frasnian	New Albany Shale

Givetian	Cedar Valley Limestone St. Laurent Formation
Eifelian	Grand Tower Limestone Wapsinicon Limestone Detroit River Formation Muscatatuck Group North Vernon Limestone Jeffersonville Limestone

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

Ludfordian	Hunton Megagroup Moccasin Springs Formation Racine Dolomite
Gorstian	Hunton Megagroup Moccasin Springs Formation Racine Dolomite

Homerian	Sugar Run Dolomite
Sheinwoodian	Hunton Megagroup Joliet Dolomite St. Clair Limestone Marcus Dolomite

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

Hirnantian	Leemon Formation
Sandbian	St. Peter Sandstone

Darriwilian	Dutchtown Limestone St. Peter Sandstone

Tremadocian	New Richmond Sandstone Oneota Dolomite Shakopee Dolomite

Bonneterre Formation

Munising Group

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