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Marmaton Group

Alternating shale and limestone, with some sandstone and coal; Lenapah FM at top and Fort Scott at base.
State Iowa
Name Marmaton Group
Geologic age Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Des Moines]
Comments Approx thickness 175-200 ft.
Primary rock type shale
Secondary rock type limestone
Other rock types sandstone; coal
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Coal (Bed)
Map references
Hershey H. G. 1969, Geologic Map of Iowa: Iowa Geological Survey, scale 1:500K
Unit references
Hershey H. G. 1969, Geologic Map of Iowa: Iowa Geological Survey, scale 1:500K
Counties Adair - Appanoose - Audubon - Cass - Clarke - Crawford - Dallas - Davis - Decatur - Guthrie - Lucas - Marion - Monona - Monroe - Polk - Shelby - Warren - Wayne