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Showing below up to 100 results in range #21 to #120.
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- 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
- 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
- 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