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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)- 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)