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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)- Elwood Formation (2 members)
- Embayment Megagroup (32 members)
- Eminence Formation (4 members)
- Enion Formation (2 members)
- Eocene Series (4 members)
- Equality Formation (6 members)
- Fraileys Shale (4 members)
- Franconia Formation (6 members)
- Franconian Stage (18 members)
- Galena Group (56 members)
- Gasperian Stage (28 members)
- Genevievian Stage (16 members)
- Glasford Formation (28 members)
- Glenwood Formation (12 members)
- Golconda Group (10 members)
- Grand Detour Formation (16 members)
- Grand Tower Limestone (10 members)
- Grover Gravel (2 members)
- Gulfian Series (15 members)
- 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)