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INDEX
M
- 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.
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
P cont.
- 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