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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)- Guttenberg Formation (6 members)
- Hannibal Shale (4 members)
- Henry Formation (6 members)
- Holocene Series (20 members)
- Hombergian Stage (12 members)
- Hunton Limestone Megagroup (112 members)
- Imported vocabulary (7 members)
- Ironton Sandstone (10 members)
- Joachim Dolomite (14 members)
- Joliet Formation (10 members)
- Kankakee Formation (10 members)
- Kaskaskia Sequence (241 members)
- Keokuk Limestone (4 members)
- 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)