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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)- Kewanee Group (103 members)
- 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)
- 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)