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- Historical:Mississippian Subsystem
- Historical:Missourian Series
- Historical:Moccasin Springs Formation
- Historical:Modern Soil
- Historical:Modesto Formation
- Historical:Momence Sandstone Member
- Historical:Montrose Chert Member
- Historical:Mooseheart Member
- Historical:Moredock Member
- Historical:Morrowan Series
- Historical:Mortimer Member
- Historical:Morton Tongue
- Historical:Mosalem Formation
- Historical:Mounds Gravel
- Historical:Mt. Carmel Sandstone Member
- Historical:Mt. Rorah Coal Member
- Historical:Mt. Simon Sandstone
- Historical:Mulberry Grove Silt Member
- Historical:Murphysboro Coal Member
- Historical:Murray Bluff Sandstone Member
- Historical:Nachusa Formation
- Historical:Neda Formation
- Historical:Negli Creek Limestone Member
- Historical:New Albany Shale Group
- Historical:New Burnside Coal Member
- Historical:New Glarus Member
- Historical:New Haven Coal Member
- Historical:New London Member
- Historical:New Richmond Sandstone
- Historical:Niagaran Series
- Historical:Noix Oolite Member
- Historical:Nokomis Sandstone Member
- Historical:North Hill Group
- Historical:Nutwood Shale Member
- Historical:O'Nan Coal Member
- Historical:Oak Grove Limestone Member
- Historical:Oakland Till Member
- Historical:Offerman Member
- Historical:Ogle Till Member
- Historical:Oglesby Member
- Historical:Okaw Group
- Historical:Omega Limestone Member
- Historical:Oneota Dolomite
- Historical:Opdyke Coal Member
- Historical:Orchard Creek Shale Member
- Historical:Ordovician System
- Historical:Otis Member
- Historical:Ottawa Limestone Megagroup
- Historical:Owl Creek Formation
- Historical:Paint Creek Group
- Historical:Paleocene Series
- Historical:Paleozoic Erathem
- Historical:Palestine Sandstone
- Historical:Palzo Sandstone Member
- Historical:Parkland Sand
- Historical:Pearl Formation
- Historical:Pecatonica Formation
- Historical:Peddicord Tongue
- Historical:Pennsylvanian Subsystem
- Historical:Pennsylvanian System
- Historical:Peoria Silt
- Historical:Petersburg Silt
- Historical:Peyton Colluvium
- Historical:Piasa Limestone
- Historical:Piatt Member
- Historical:Pike Soil
- Historical:Plaines Member
- Historical:Plano Silt Member
- Historical:Platteville Group
- Historical:Plattin Subgroup
- Historical:Pleasant Grove Soil
- Historical:Pleasantview Sandstone Member
- Historical:Pleistocene Series
- Historical:Pliocene Series
- Historical:Pokeberry Limestone Member
- Historical:Pond Creek Coal Member
- Historical:Popcorn Sandstone Member
- Historical:Pope Creek Coal Member
- Historical:Pope Megagroup
- Historical:Porters Creek Formation
- Historical:Potosi Dolomite
- Historical:Potsdam Sandstone Megagroup
- Historical:Pounds Sandstone Member
- Historical:Prairie du Chien Group
- Historical:Precambrian Erathem
- Historical:Prospect Hill Siltstone
- Historical:Proviso Siltstone Member
- Historical:Purington Shale Member
- Historical:Quaternary System
- Historical:Quimbys Mill Formation
- Historical:Raccoon Creek Group
- Historical:Racine Formation
- Historical:Radnor Till Member
- Historical:Ramp Creek Limestone Member
- Historical:Rapid Member
- Historical:Ravinia Sand Member
- Historical:Reel Limestone Member
- Historical:Reelsville Limestone Member
- Historical:Reisner Limestone Member
- Historical:Renault Limestone
- Historical:Rendleman Oolite Bed
- Historical:Reynoldsburg Coal Member
- Historical:Richland Loess
- Historical:Richmondian Stage
- Historical:Ridenhower Formation
- Historical:Rivoli Member
- Historical:Robein Member
- Historical:Roby Silt Member
- Historical:Rocher Member
- Historical:Rock Branch Coal Member
- Historical:Rock Island Coal Member
- Historical:Romeo Member
- Historical:Roodhouse coal bed
- Historical:Rosiclare Sandstone Member
- Historical:Roxana Silt
- Historical:Salem Limestone
- Historical:Sample Sandstone Member
- Historical:Sangamon Soil
- Historical:Sankoty Sand Member
- Historical:Sauk Sequence
- Historical:Saverton Shale
- Historical:Scales Shale
- Historical:Schweizer Member
- Historical:Scottsburg Limestone Member
- Historical:Scottville Limestone Member
- Historical:Seahorne Limestone Member
- Historical:Seelyville Coal Member
- Historical:Sellers Limestone Bed
- Historical:Seville Limestone Member
- Historical:Sexton Creek Limestone
- Historical:Shakopee Dolomite
- Historical:Sharpsboro Member
- Historical:Shawneetown Coal Member
- Historical:Sheboygan Member
- Historical:Shelbyville Coal Member
- Historical:Sherwood Member
- Historical:Shetlerville Limestone Member
- Historical:Shoal Creek Limestone Member
- Historical:Shorewood Member
- Historical:Shullsburg Member
- Historical:Shumway Limestone Member
- Historical:Silurian System
- Historical:Sinsinawa Member
- Historical:Smithboro Till Member
- Historical:Snider Till Member
- Historical:Solon Member
- Historical:Sonora Formation
- Historical:Sorento Limestone Member
- Historical:South Haven Member
- Historical:Spar Mountain Sandstone Member
- Historical:Spechts Ferry Formation
- Historical:Spoon Formation
- Historical:Spring Grove Member
- Historical:Spring Lake Coal Member
- Historical:Springfield Coal Member
- Historical:Springville Shale
- Historical:St. Clair Limestone
- Historical:St. David Limestone Member
- Historical:St. James Member
- Historical:St. Louis Limestone
- Historical:St. Peter Sandstone
- Historical:Starrs Cave Limestone
- Historical:Starved Rock Sandstone Member
- Historical:State Pond Member
- Historical:Ste. Genevieve Limestone
- Historical:Sterling Till Member
- Historical:Stewartville Member
- Historical:Stillman Member
- Historical:Stonefort Limestone Member
- Historical:Strawbridge Member
- Historical:Sugar Run Formation
- Historical:Summum Coal Member
- Historical:Sweeney Formation
- Historical:Sweetland Creek Shale
- Historical:Sylamore Sandstone
- Historical:Tar Springs Sandstone
- Historical:Tarter Coal Member
- Historical:Teneriffe Silt
- Historical:Tertiary System
- Historical:Tete de Morts Formation
- Historical:Thebes Sandstone Member
- Historical:Tilton Till Member
- Historical:Tioga Bentonite Bed
- Historical:Tippecanoe Sequence
- Historical:Tiskilwa Formation
- Historical:Tonti Sandstone Member
- Historical:Toulon Member
- Historical:Trempealeauan Stage
- Historical:Trentonian Stage
- Historical:Tripp Limestone Member
- Historical:Trivoli Sandstone Member
- Historical:Troutman Member
- Historical:Trowbridge Coal Member
- Historical:Tuscaloosa Formation
- Historical:Two Rivers Member
- Historical:Tygett Sandstone Member
- Historical:Tyson Member
- Historical:Ullin Limestone
- Historical:Upper Devonian Series
- Historical:Valmeyeran Series
- Historical:Vandalia Till Member
- Historical:Vergennes Sandstone Member
- Historical:Vermilionville Sandstone Member
- Historical:Victory Member
- Historical:Vienna Limestone
- Historical:Virgilian Series
- Historical:Wadsworth Formation
- Historical:Walche Limestone Member
- Historical:Walgreen Member
- Historical:Wall Member
- Historical:Walnut Grove Limestone Member
- Historical:Waltersburg Formation
- Historical:Wapsipinicon Limestone
- Historical:Warsaw Shale
- Historical:Wasco Member
- Historical:Waukegan Member
- Historical:Wayside Member
- Historical:Wedron Group
- Historical:West Baden Group
- Historical:West Franklin Limestone Member
- Historical:Wilcox Formation
- Historical:Wiley Coal Member
- Historical:Wilhelmi Formation
- Historical:Willis Coal Member
- Historical:Wilmette Bed
- Historical:Winnebago Formation
- Historical:Winnetka Member
- Historical:Winslow Till Member
- Historical:Wise Lake Formation
- Historical:Wise Ridge Coal Member
- Historical:Witt Coal Member
- Historical:Womac Coal Member
- Historical:Woodbury Limestone Member
- Historical:Wyota Member
- Historical:Yankeetown Sandstone
- Historical:Yarmouth Soil
- Historical:Yorkville Member