List of fossiliferous stratigraphic units in Illinois

This article contains a list of fossil-bearing stratigraphic units in the state of Illinois, U.S.

Sites

Group or Formation	Period	Notes
Altamont Formation	Carboniferous
Platteville Limestone	Ordovician
St. Louis Limestone	Carboniferous
Brainard Formation	Ordovician
Carbondale Formation	Carboniferous
Caseyville Formation	Carboniferous
Cedar Valley Formation	Devonian
Little Cedar Formation	Devonian
Chester Formation	Carboniferous
Hardinsburg Formation	Carboniferous
Clore Formation	Carboniferous
Tar Springs Formation	Carboniferous
Chouteau Formation	Carboniferous
Clayton Formation	Paleogene
Decorah Shale	Ordovician
Degonia Formation	Carboniferous
Des Moines Formation	Carboniferous
Drurey Shale	Carboniferous
English River Formation	Carboniferous
Fort Scott Limestone	Carboniferous
Fraileys Formation	Carboniferous
Fraileys Shale	Carboniferous
Galena Dolomite	Ordovician
Dubuque Formation	Ordovician
Dunleith Formation	Ordovician
Guttenberg Formation	Ordovician
Ion Formation	Ordovician
Wise Lake Formation	Ordovician
Glen Park Formation	Carboniferous
Glenwood Formation	Ordovician
Golconda Formation	Carboniferous
Golconda Group	Carboniferous
Haney Formation	Carboniferous
Gower Formation	Silurian
Grand Detour Formation	Ordovician
Grand Tower Limestone	Devonian
Haney Limestone	Carboniferous
Iola Formation	Carboniferous
Kansas City Formation	Carboniferous
Keokuk Limestone	Carboniferous
Spoon Formation	Carboniferous
Kimmswick Limestone	Ordovician
Kinkaid Formation	Carboniferous
Linton Formation	Carboniferous
Maquoketa Formation	Ordovician
Brainard Shale	Ordovician
Fort Atkinson Limestone	Ordovician
Neda Formation	Ordovician
Scales Shale	Ordovician
Mattoon Formation	Carboniferous
McCraney Limestone	Carboniferous
Bond Formation	Carboniferous
Patoka Formation	Carboniferous
Shelburn Formation	Carboniferous
McLeansbough Formation	Carboniferous
Mifflin Formation	Ordovician
Mosalem Formation	Silurian
Nachusa Formation	Ordovician
Glen Dean Formation	Carboniferous
Orchard Creek Shale	Ordovician
Paint Creek Formation	Carboniferous
Pawnee Formation	Carboniferous
Pecatonica Formation	Ordovician
McGregor Formation	Ordovician
Prosser Limestone	Ordovician
Purington Shale	Carboniferous
Quimbys Mill Formation	Ordovician
Racine Dolomite	Silurian
Ridenhower Formation	Carboniferous
Salem Formation	Carboniferous
Shakopee Formation	Ordovician
Spechts Ferry Formation	Ordovician
St. Laurent Formation	Devonian
St. Louis Formation	Carboniferous
St. Peter Sandstone	Ordovician
Ste. Genevieve Limestone	Carboniferous
Sturgis Formation	Carboniferous
Sugar Run Dolomite	Silurian
Tradewater Formation	Carboniferous
Verdigris Formation	Carboniferous
Waltersburg Formation	Carboniferous
Warsaw Formation	Carboniferous
Wilhelmi Formation	Silurian

See also

• Paleontology in Illinois

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.