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INDEX
R
- Rocher Member
- Rock Branch Coal Member
- Rock Island Coal Member
- Romeo Member
- Roodhouse coal bed
- Rosiclare Sandstone Member
- Roxana Silt
S
S cont.
- 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
- Shorewood Member
- Shullsburg Member
- Shumway Limestone Member
- Silurian System
- Sinsinawa Member
- Smithboro Till Member
S cont.
- 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