State | South Dakota |
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Name | Graneros Shale |
Geologic age | Upper Cretaceous |
Lithologic constituents |
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)Dark-gray, noncalcareous, pyritic, poorly fossiliferous shale.
Minor
Sedimentary > Clastic > Sandstone (Bed)Numerous sandstone layers at the base
|
References | Tomhave, D.W., and Schulz, L.D., 2004, Bedrock Geologic Map Showing Configuration of the Bedrock Surface in South Dakota East of the Missouri River, South Dakota Geological Survey, GM 9, scale 1:500,000. |
NGMDB product | |
Counties | Clay - Grant - Hutchinson - Lincoln - Roberts - Turner - Union - Yankton |