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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)- Carbondale Formation (95 members)
- Caseyville Formation (12 members)
- Cedar Bluff Limestone Group (14 members)
- Cedar Valley Limestone (10 members)
- Cenozoic Erathem (217 members)
- Champlainian Series (174 members)
- Chazyan Stage (4 members)
- Chert (4 members)
- Chert Gravel (2 members)
- Chesterian Series (80 members)
- 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)