Marmaton Group

Interval includes Morgan School, Mouse Creek, Labette, Pawnee, Bandera, Altamont, Nowata, Lenapah, Memorial, Lost Branch formations. Primary Lithologies: shale/mudstone, light to dark gray; limestone, fossiliferous. Secondary Lithologies: mudstone, green-gray to red/maroon; shale, black, phosphatic; sandstone, very fine to medium grained. Minor: coal; siltstone, conglomerate. Maximum thicknesses: 125-175 ft (38-52 m).
State Iowa
Name Marmaton Group
Geologic age Middle Pennsylvanian, upper Desmoinesian
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)fossiliferous
Sedimentary > Clastic > Mudstone > Shale (Bed)shale/mudstone, light to dark gray
Minor
Sedimentary > Clastic > Sandstone (Bed)very fine to medium grained
Sedimentary > Clastic > Mudstone (Bed)green-gray to red/maroon
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)phosphatic
Incidental
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Coal (Bed)
References

Witzke, Brian J., Anderson, Raymond R., and Pope, John P., 2010, Iowa Geological and Water Survey, DNR, Bedrock Geologic Map of Iowa, OFM-2010-1. Scale 1:500,000.

NGMDB product
Counties Adair - Appanoose - Audubon - Boone - Carroll - Cass - Clarke - Crawford - Dallas - Davis - Decatur - Guthrie - Harrison - Lucas - Madison - Marion - Monona - Monroe - Polk - Pottawattamie - Shelby - Warren - Wayne