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INDEX
M
- 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
- Nachusa Formation
- 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 cont.
- 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
P cont.
- 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
- Raccoon Creek Group
- Racine Formation
- Radnor Till Member
- Ramp Creek Limestone Member
- Rapid Member
- Reel Limestone Member
- Reelsville Limestone Member
- Reisner Limestone Member
- Renault Limestone
- Rendleman Oolite Bed
- Reynoldsburg Coal Member
- Richmondian Stage
- Ridenhower Formation
- Rivoli Member
- Robein Member
- Roby Silt Member