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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 50 | next 50) (20 | 50 | 100 | 250 | 500)- Peoria Silt (2 members)
- Platteville Group (62 members)
- Plattin Subgroup (46 members)
- Pleistocene Series (177 members)
- Pliocene Series (6 members)
- Pope Megagroup (96 members)
- 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)
- Spechts Ferry Formation (6 members)
- Spoon Formation (51 members)
- Springville Shale (4 members)
- St. Peter Sandstone (8 members)
- Ste. Genevieve Limestone (10 members)
- Tertiary System (22 members)
- Tippecanoe Sequence (272 members)
- Tiskilwa Formation (6 members)
- Trempealeauan Stage (24 members)
- Trentonian Stage (60 members)
- Tuscaloosa Formation (3 members)
- Ullin Limestone (6 members)
- Upper Devonian Series (14 members)
- Valmeyeran Series (70 members)
- Virgilian Series (18 members)
- Wadsworth Formation (2 members)
- Wapsipinicon Limestone (12 members)
- Wedron Group (28 members)
- West Baden Group (14 members)
- West Lebanon Formation (1 member)
- Wilcox Formation (2 members)
- Wilhelmi Formation (6 members)
- Winnebago Formation (8 members)
- Wise Lake Formation (6 members)