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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)- 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)
- Spechts Ferry Formation (6 members)
- Spoon Formation (51 members)
- Springville Shale (4 members)
- St. Peter Sandstone (8 members)
- Ste. Genevieve Limestone (10 members)