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INDEX
R
- Reelsville Limestone Member
- Reisner Limestone Member
- Renault Limestone
- Rendleman Oolite Bed
- 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
S cont.
- 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
- Snider Till Member
- Solon Member
- Sonora Formation
- Sorento Limestone Member
- Spar Mountain Sandstone Member
- Spechts Ferry Formation