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