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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)- Non-marine Sand, Clay, and Silt (2 members)
- North Hill Group (6 members)
- Okaw Group (14 members)
- Oneota Dolomite (6 members)
- Oolite (4 members)
- Ordovician System (227 members)
- Ottawa Limestone Megagroup (164 members)
- Owl Creek Formation (2 members)
- Paint Creek Group (14 members)
- Paleocene Series (6 members)
- Paleozoic Erathem (925 members)
- Pearl Formation (6 members)
- Pecatonica Formation (14 members)
- Pennsylvanian Subsystem (316 members)
- Peoria Silt (2 members)
- Platteville Group (62 members)
- Plattin Subgroup (46 members)
- Pleistocene Series (177 members)
- Pliocene Series (6 members)
- Pope Megagroup (96 members)