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INDEX
P
- Plano Silt Member
- Platteville Group
- Plattin Subgroup
- Pleasant Grove Soil
- Pleasantview Sandstone Member
- Pleistocene Series
- Pliocene Series
- Pokeberry Limestone Member
- Pond Creek Coal Member
- Popcorn Sandstone Member
- Pope Creek Coal Member
- Pope Megagroup
- Porters Creek Formation
- Post Creek Formation
- Potosi Dolomite
- Potsdam Sandstone Megagroup
- Pounds Sandstone Member
P cont.
- Prairie du Chien Group
- Precambrian Erathem
- Prospect Hill Siltstone
- Proviso Siltstone Member
- Purington Shale Member
Q
R
R cont.
- Reynoldsburg Coal Member
- Richmondian Stage
- Ridenhower Formation
- Rivoli Member
- Robein Member
- Roby Silt Member
- Rocher Member
- Rock Branch Coal Member
- Rock Island Coal Member
- Romeo Member
- Roodhouse coal bed
- Rosiclare Sandstone Member
- Roxana Silt
S