State | Iowa |
---|---|
Name | Lower Cherokee Group and Raccoon Creek Group |
Geologic age | Lower-Middle Pennsylvanian; Morrowan-lower Desmoinesian |
Lithologic constituents |
Major
Sedimentary > Clastic > Siltstone (Bed)gray
Sedimentary > Clastic > Sandstone (Bed)very fine to medium grained; incidental coarse-grained to granular, part conglomeratic
Sedimentary > Clastic > Mudstone > Shale (Bed, Carbonaceous)shale/mudstone, light to dark gray, part silty to sandy; minor carbonaceous shale/mudstone, gray to black; incidental red to pink
Minor
Sedimentary > Carbonate > Limestone (Bed)dense, part fossiliferous, part sandy
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)phosphatic
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 - Benton - Boone - Calhoun - Carroll - Cedar - Clarke - Clinton - Crawford - Dallas - Davis - Decatur - Des Moines - Franklin - Greene - Grundy - Guthrie - Hamilton - Hardin - Harrison - Henry - Humboldt - Ida - Iowa - Jackson - Jasper - Jefferson - Johnson - Jones - Keokuk - Lee - Linn - Louisa - Lucas - Madison - Mahaska - Marion - Marshall - Monona - Monroe - Muscatine - Polk - Pottawattamie - Poweshiek - Sac - Scott - Shelby - Story - Van Buren - Wapello - Warren - Washington - Wayne - Webster - Woodbury - Wright |