Graneros Shale

Dark-gray, noncalcareous, pyritic, poorly fossiliferous shale, with numerous sandstone layers at the base. Thickness up to 110 ft (36 m).
State South Dakota
Name Graneros Shale
Geologic age Upper Cretaceous
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale (Bed)Dark-gray, noncalcareous, pyritic, poorly fossiliferous shale.
Sedimentary > Clastic > Sandstone (Bed)Numerous sandstone layers at the base

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