Upper Cherokee Group

Interval includes Verdigris and Swede Hollow formations; base of map unit drawn at the widespread Whitebreast Coal. Primary Lithologies: shale/mudstone, light to dark gray, part silty to sandy; siltstone, gray. Secondary Lithologies: limestone, part fossiliferous, part sandy; sandstone, very fine to fine-grained. Minor: mudstone, red/maroon to brown; shale, black, phosphatic; carbonaceous shale; coal (beds locally > 2 ft); ironstone/siderite concretions; limestone concretions (may be septarian); pyrite. Average thickness 100 ft (30 m); maximum thicknesses to 130 ft (40 m).
State Iowa
Name Upper Cherokee Group
Geologic age Middle Pennsylvanian, middle Desmoinesian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)shale/mudstone, light to dark gray, part silty to sandy; incidental red/maroon to brown; incidental carbonaceous
Sedimentary > Clastic > Siltstone (Bed)gray
Minor
Sedimentary > Carbonate > Limestone (Bed)part fossiliferous, part sandy
Sedimentary > Clastic > Sandstone (Bed)very fine to fine-grained
Incidental
Sedimentary > Coal (Bed)
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)phosphatic
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 - Calhoun - Carroll - Clarke - Crawford - Dallas - Davis - Decatur - Greene - Guthrie - Hamilton - Harrison - Jasper - Lucas - Madison - Mahaska - Marion - Monona - Monroe - Polk - Pottawattamie - Shelby - Story - Wapello - Warren - Wayne - Webster