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Showing below up to 50 results in range #101 to #150.
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- 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
- 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