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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
- 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
- Salem Limestone
- Sample Sandstone Member
- Sangamon Soil
- Sankoty Sand Member
- Sauk Sequence
- Saverton Shale
- Scales Shale
- Schweizer Member
- Scottsburg Limestone Member
- Scottville Limestone Member
- Seahorne Limestone Member
- Seelyville Coal Member
- Sellers Limestone Bed
- Seville Limestone Member
- Sexton Creek Limestone
- Shakopee Dolomite
- Sharpsboro Member
- Shelbyville Coal Member
- Sherwood Member
- Shetlerville Limestone Member
- Shoal Creek Limestone Member
S cont.
- Shorewood Member
- Shullsburg Member
- Shumway Limestone Member
- Silurian System
- Sinsinawa Member
- Smithboro Till Member
- Snider Till Member
- Solon Member
- Sonora Formation
- Sorento Limestone Member
- Spar Mountain Sandstone Member
- Spechts Ferry Formation
- Spoon Formation
- Spring Grove Member
- Springfield Coal Member
- Springville Shale
- St. Clair Limestone
- St. David Limestone Member
- St. James Member
- St. Louis Limestone
- St. Peter Sandstone
- Starrs Cave Limestone
- Starved Rock Sandstone Member
- State Pond Member
- Ste. Genevieve Limestone
- Sterling Till Member
- Stewartville Member
- Stillman Member
- Stonefort Limestone Member
- Strawbridge Member
- Sugar Run Formation
- Survant Coal Member