| 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 |