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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)- Porters Creek Formation (2 members)
- Post Creek Formation (1 member)
- Potsdam Sandstone Megagroup (18 members)
- Prairie du Chien Group (14 members)
- Precambrian (3 members)
- Producing Zones and Informal Names (76 members)
- Quaternary System (200 members)
- Quimbys Mill Formation (8 members)
- Raccoon Creek Group (9 members)
- Renault Limestone (8 members)
- Richmondian Stage (10 members)
- Ridenhower Formation (8 members)
- Roxana Silt (10 members)
- Salem Limestone (10 members)
- Sandstone (77 members)
- Sauk Sequence (76 members)
- Scales Shale (10 members)
- Shale (49 members)
- Silurian System (62 members)
- Soil (16 members)