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INDEX
S
- 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
T cont.
- Trowbridge Coal Member
- Turner Mine Shale Member
- Tuscaloosa Formation
- 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
- Valmeyeran Series
- Vandalia Till Member
- Vergennes Sandstone Member
- Vermilionville Sandstone Member
- Victory Member
- Vienna Limestone
- Virgilian Series
W
W cont.
- Wasco Member
- Waukegan 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
- Wilmette Bed
- Winnebago Formation
- Winnetka Member
- 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