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INDEX
L
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
M cont.
- 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.
- 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