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INDEX
M
- 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
M cont.
- 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.
- 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