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INDEX
L
M
M cont.
- 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