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INDEX
P
Q
R
- Raccoon Creek Group
- Racine Formation
- Radnor Till Member
- Ramp Creek Limestone Member
- Rapid Member
- Reel Limestone Member
- 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
S cont.
- 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
- 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
S cont.
- 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
- Sweeney Formation
- Sweetland Creek Shale
- Sylamore Sandstone
T
- Tar Springs Sandstone
- Tarter Coal Member
- Teneriffe Silt
- Tertiary System
- Tete de Morts Formation
- Thebes Sandstone Member
- Tilton Till Member
- Tioga Bentonite Bed
- Tippecanoe Sequence
- Tiskilwa Formation
- Tonti Sandstone Member
- Toulon Member
- Trempealeauan Stage
- Trentonian Stage
- Tripp Limestone Member
- Trivoli Sandstone Member
- Troutman Member