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Abandoned Names
Abbott Formation
Absaroka Sequence
Alburnett Formation
Alexandrian Series
Ancell Group
Atokan Series
Aux Vases Sandstone
Banner Formation
Baylis Formation
Bentonite
Blackriveran Stage
Blanding Formation
Bond Formation
Borden Siltstone
Bulletin 104
Bulletin 94
Bulletin 95
Cambrian System
Canadian Series
Carbondale Formation
Caseyville Formation
Cedar Bluff Limestone Group
Cedar Valley Limestone
Cenozoic Erathem
Champlainian Series
Chazyan Stage
Chert
Chert Gravel
Chesterian Series
Cincinnatian Series
Circular 605
Clay
Clayton Formation
Clore Formation
Coal
Conglomerate
Cretaceous System
Croixan Series
Croxian Series
Decorah Subgroup
Desmoinesian Series
Devonian System
Dolomite
Dresbachian Stage
Dunleith Formation
Dutchtown Limestone
Eau Claire Formation
Edenian Stage
Edgewood Formation
Elviran Stage
Elwood Formation
Embayment Megagroup
Eminence Formation
Enion Formation
Eocene Series
Equality Formation
Fraileys Shale
Franconia Formation
Franconian Stage
Galena Group
Gasperian Stage
Genevievian Stage
Glasford Formation
Glenwood Formation
Golconda Group
Grand Detour Formation
Grand Tower Limestone
Grover Gravel
Gulfian Series
Guttenberg Formation
Hannibal Shale
Henry Formation
Holocene Series
Hombergian Stage
Hunton Limestone Megagroup
Imported vocabulary
Ironton Sandstone
Joachim Dolomite
Joliet Formation
Kankakee Formation
Kaskaskia Sequence
Keokuk Limestone
Kewanee Group
Kewaunee Formation
Kimmswick Subgroup
Kinderhookian Series
Kings Lake Formation
Kinkaid Limestone
Knobs Megagroup
Knox Dolomite Megagroup
Lake Michigan Formation
Lemont Formation
Limestone
Lingle Formation
Lower Devonian Series
Mammoth Cave Limestone Megagroup
Maquoketa Shale Group
Mason Group
Mattoon Formation
Maysvillian Stage
Mazon Creek
Mazoncreek
McCormick Group
McLeansboro Group
McNairy Formation
Menard Limestone
Mesozoic Erathem
Middle Devonian Series
Mifflin Formation
Mississippian Subsystem
Missourian Series
Modesto Formation
Morrowan Series
Mounds Gravel
Mt. Simon Sandstone
Nachusa Formation
New Albany Shale Group
Niagaran Series
Non-marine Sand, Clay, and Silt
North Hill Group
Okaw Group
Oneota Dolomite
Oolite
Ordovician System
Ottawa Limestone Megagroup
Owl Creek Formation
Paint Creek Group
Paleocene Series
Paleozoic Erathem
Pearl Formation
Pecatonica Formation
Pennsylvanian Subsystem
Peoria Silt
Platteville Group
Plattin Subgroup
Pleistocene Series
Pliocene Series
Pope Megagroup
Porters Creek Formation
Post Creek Formation
Potsdam Sandstone Megagroup
Prairie du Chien Group
Precambrian
Producing Zones and Informal Names
Quaternary System
Quimbys Mill Formation
Raccoon Creek Group
Renault Limestone
Richmondian Stage
Ridenhower Formation
Roxana Silt
Salem Limestone
Sandstone
Sauk Sequence
Scales Shale
Shale
Silurian System
Soil
Spechts Ferry Formation
Spoon Formation
Springville Shale
St. Peter Sandstone
Ste. Genevieve Limestone
Tertiary System
Tippecanoe Sequence
Tiskilwa Formation
Trempealeauan Stage
Trentonian Stage
Tuscaloosa Formation
Ullin Limestone
Upper Devonian Series
Valmeyeran Series
Virgilian Series
Wadsworth Formation
Wapsipinicon Limestone
Wedron Group
West Baden Group
West Lebanon Formation
Wilcox Formation
Wilhelmi Formation
Winnebago Formation
Wise Lake Formation
Wolf Creek Formation
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Illinois State Geological Survey
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