| State | South Dakota |
|---|---|
| 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 |