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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 20 | next 20) (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)