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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)- 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)