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INDEX
T
- 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
U cont.
V
- Valmeyeran Series
- Vandalia Till Member
- Vergennes Sandstone Member
- Vermilionville Sandstone Member
- Victory Member
- Vienna Limestone
- Virgilian Series
W
W cont.
- 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