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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)- 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)