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INDEX
S
- 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
- 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
- Trowbridge Coal Member
- Turner Mine Shale Member
- Two Rivers Member
- Tygett Sandstone Member
- Tyson Member
U
- Ullin Limestone
- Unnamed clastic member - Carbondale Formation
- Unnamed gray shale member - Carbondale Formation
- Upper Devonian Series
V
W
- Wadsworth Formation
- Walche Limestone Member
- Walgreen Member
- Wall Member
- Walnut Grove Limestone Member
- Walshville Member
- Waltersburg Formation
- Wapsipinicon Limestone
- Warsaw Shale
- Wasco Member
- Wayside Member
- Wedron Group
- West Baden Group
- West Franklin Limestone Member
- West Lebanon Formation
- Wheeler Coal Member or Bed
- Wilcox Formation
- Wilhelmi Formation
- Will Scarlet Shale Member
- Willis Coal Member
- Winnebago Formation
- Winslow Till Member
- Wise Lake Formation
- Wise Ridge Coal Member
- Witt Coal Member
- Wolf Creek Formation
- Womac Coal Member
- Woodbury Limestone Member
- Wyota Member
Y