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INDEX
L
- La Salle Limestone Member
- Lacey Member
- Lacon Formation
- Lagonda Member
- Lake Creek Coal Member
- Lake Michigan Formation
- Lake Michigan Member
- Lawson Shale Member
- Lee Center Till Member
- Lemont Formation
- Levias Limestone Member
- Levings Member
- Lierle Clay Member
- Lingle Formation
- Litchfield Coal Member
- Little Bear Soil
- Little Vermilion Limestone Member
- Livingston Limestone Member
- Lombard Dolomite Member
- Lonsdale Limestone Member
- Loughridge Sandstone Member
- Louisiana Limestone
- Loveland Silt
- Lovell Member
- Lower Devonian Series
M
- Mackinaw Member
- Macoupin Limestone Member
- Mahomet Sand Member
- Malden Till Member
- Mammoth Cave Limestone Megagroup
- Manitowoc Member
- Manley Coal Member
- Maquoketa Shale Group
- Marcus Formation
- Markgraf Member
- Markham Silt Member
- Marywood Member
- Mascoutah facies
- Mason Group
- Matson Member
- Mattoon Formation
- Mayfield Member
- Maysvillian Stage
- McCleary's Bluff Coal Member
- McCraney Limestone
- McDonough Loess Member
- McLeansboro Group
- McNairy Formation
- McWain Sandstone Member
- Meadow Loess Member
- Mecca Quarry Shale Member
- Medusa Member
- Menard Limestone
- Meppen Limestone
- Merom Sandstone Member
- Mesozoic Erathem
- Metropolis Formation
- Metz Member
- Middle Devonian Series
- Mifflin Formation
- Millersville Limestone Member
- Mincke Member
- Misenheimer Shale Member
- Mississippian Subsystem
- Missourian Series
- Moccasin Springs Formation
- Modern Soil
- Modesto Formation
- Momence Sandstone Member
- Montrose Chert Member
- Mooseheart Member
- Moredock Member
- Morrowan Series
- Mortimer Member
- Morton Tongue
- Mosalem Formation
- Mounds Gravel
- Mt. Carmel Sandstone Member
- Mt. Rorah Coal Member
- Mt. Simon Sandstone
- Mulberry Grove Silt Member
- Murphysboro Coal Member
- Murray Bluff Sandstone Member
N
N cont.
- Neda Formation
- Negli Creek Limestone Member
- New Albany Shale Group
- New Burnside Coal Member
- New Glarus Member
- New Haven Coal Member
- New London Member
- New Richmond Sandstone
- Niagaran Series
- Noix Oolite Member
- Nokomis Sandstone Member
- North Hill Group
- Nutwood Shale Member
O
- O'Nan Coal Member
- Oak Grove (Limestone) Member
- Oak formation
- 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.
- 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
- 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