State | Iowa |
---|---|
Name | Shawnee Group |
Geologic age | Upper Pennsylvanian, lower-middle Virgilian |
Lithologic constituents |
Major
Sedimentary > Carbonate > Limestone (Bed)fossiliferous, part coated grain/Osagia
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)light to dark gray; minor pedogenic mudstone, part calcareous/nodular; incidental coaly shale
Minor
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)phosphatic
Sedimentary > Clastic > Siltstone (Bed)siltstone to very fine sandstone
Incidental
Sedimentary > Coal (Bed)
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Clastic > Mudstone (Bed)red-brown
|
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 - Adams - Cass - Fremont - Mills - Montgomery - Page - Pottawattamie - Taylor - Union |