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INDEX
S
- 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
T cont.
- 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
- Trowbridge Coal Member
- Turner Mine Shale Member
- Two Rivers Member
- Tygett Sandstone Member
T cont.
U
- Ullin Limestone
- Unnamed clastic member - Carbondale Formation
- Unnamed gray shale member - Carbondale Formation
- Upper Devonian Series
V
- Valmeyeran Series
- Vandalia Till Member
- Vergennes Sandstone Member
- Vermilionville Sandstone Member
- Victory Member
- Vienna Limestone
- Virgilian Series
W