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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)- Cincinnatian Series (30 members)
- Circular 605 (111 members)
- Clay (2 members)
- Clayton Formation (2 members)
- Clore Formation (8 members)
- Coal (112 members)
- Conglomerate (2 members)
- Cretaceous System (20 members)
- Croixan Series (60 members)
- Croxian Series (2 members)
- Decorah Subgroup (20 members)
- Desmoinesian Series (178 members)
- Devonian System (84 members)
- Dolomite (6 members)
- Dresbachian Stage (32 members)
- Dunleith Formation (26 members)
- Dutchtown Limestone (6 members)
- Eau Claire Formation (8 members)
- Edenian Stage (4 members)
- Edgewood Formation (4 members)
- Elviran Stage (38 members)
- 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)