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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
(first | last) View (previous 50 | next 50) (20 | 50 | 100 | 250 | 500)- Mattoon Formation (38 members)
- Maysvillian Stage (12 members)
- Mazon Creek (1 member)
- Mazoncreek (0 members)
- McCormick Group (32 members)
- McLeansboro Group (120 members)
- McNairy Formation (4 members)
- Menard Limestone (8 members)
- Mesozoic Erathem (24 members)
- Middle Devonian Series (50 members)
- Mifflin Formation (12 members)
- Mississippian Subsystem (178 members)
- Missourian Series (74 members)
- Modesto Formation (46 members)
- Morrowan Series (14 members)
- Mounds Gravel (2 members)
- Mt. Simon Sandstone (16 members)
- Nachusa Formation (8 members)
- New Albany Shale Group (20 members)
- Niagaran Series (20 members)
- Non-marine Sand, Clay, and Silt (2 members)
- North Hill Group (6 members)
- Okaw Group (14 members)
- Oneota Dolomite (6 members)
- Oolite (4 members)
- Ordovician System (227 members)
- Ottawa Limestone Megagroup (164 members)
- Owl Creek Formation (2 members)
- Paint Creek Group (14 members)
- Paleocene Series (6 members)
- Paleozoic Erathem (925 members)
- Pearl Formation (6 members)
- Pecatonica Formation (14 members)
- Pennsylvanian Subsystem (316 members)
- Peoria Silt (2 members)
- Platteville Group (62 members)
- Plattin Subgroup (46 members)
- Pleistocene Series (177 members)
- Pliocene Series (6 members)
- Pope Megagroup (96 members)
- Porters Creek Formation (2 members)
- Post Creek Formation (1 member)
- Potsdam Sandstone Megagroup (18 members)
- Prairie du Chien Group (14 members)
- Precambrian (3 members)
- Producing Zones and Informal Names (76 members)
- Quaternary System (200 members)
- Quimbys Mill Formation (8 members)
- Raccoon Creek Group (9 members)
- Renault Limestone (8 members)