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INDEX
O
- Oakland Till Member
- Offerman Member
- Ogle Till Member
- Oglesby Member
- Okaw Group
- Omega Limestone Member
- Omphghent member
- Oneota Dolomite
- Opdyke Coal Member
- Orchard Creek Shale Member
- Ordovician System
- Otis Member
- Ottawa Limestone Megagroup
- Owl Creek Formation
P
- Paint Creek Group
- Paleocene Series
- Paleozoic Erathem
- Palestine Sandstone
- Pearl Formation
- Pecatonica Formation
- Peddicord Tongue
- Pennsylvanian Subsystem
- Peoria Silt
- Percy Limestone Member
- Petersburg Silt
- Peyton Colluvium
- Piasa Limestone
- Piatt Member
- Pike Soil
- Plaines Member
- Plano Silt Member
- Platteville Group
- Plattin Subgroup
- Pleasant Grove Soil
- Pleasantview Sandstone Member
- Pleistocene Series
- Pliocene Series
- Pokeberry Limestone Member
- Pond Creek Coal Member
- Popcorn Sandstone Member
- Pope Creek Coal Member
- Pope Megagroup
- Porters Creek Formation
- Post Creek Formation
- Potosi Dolomite
- Potsdam Sandstone Megagroup
- Pounds Sandstone Member
- Prairie du Chien Group
- Precambrian Erathem
- Prospect Hill Siltstone
- Proviso Siltstone Member
- Purington Shale Member
Q
R
R cont.
- 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
- Salem Limestone
- Sample Sandstone Member
- Sangamon Soil
- Sankoty Sand Member
- Sauk Sequence
- Saverton Shale
- Scales Shale
- 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
- 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
S cont.
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
- Valmeyeran Series
- Vandalia Till Member
- Vergennes Sandstone Member
- Vermilionville Sandstone Member
- Victory Member
- Vienna Limestone
- Virgilian Series
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