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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)- Limestone (176 members)
- Lingle Formation (12 members)
- Lower Devonian Series (10 members)
- Mammoth Cave Limestone Megagroup (68 members)
- Maquoketa Shale Group (20 members)
- Mason Group (22 members)
- 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)