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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)- Kewaunee Formation (8 members)
- Kimmswick Subgroup (36 members)
- Kinderhookian Series (18 members)
- Kings Lake Formation (6 members)
- Kinkaid Limestone (6 members)
- Knobs Megagroup (24 members)
- Knox Dolomite Megagroup (58 members)
- Lake Michigan Formation (7 members)
- Lemont Formation (8 members)
- 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)