Carlile Shale

Dark-gray to black, silty to sandy shale with several zones of septarian, fossiliferous, carbonate concretions. Contains up to three sandstone units in the upper portion of the formation and sandy calcareous marl at the base. Thickness up to 330 ft (100 m).
State South Dakota
Name Carlile Shale
Geologic age Upper Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)Dark-gray to black, silty to sandy shale
Minor
Sedimentary > Clastic > Sandstone (Bed)Contains up to three sandstone units in the upper portion of the formation
Sedimentary > Carbonate (Bed)Several zones of septarian, fossiliferous, carbonate concretions.
Sedimentary > Carbonate > Marlstone (Bed, Calcareous)Sandy calcareous marl 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 Aurora - Bon Homme - Brule - Butte - Charles Mix - Clay - Codington - Custer - Davison - Deuel - Douglas - Fall River - Grant - Gregory - Hanson - Hutchinson - Lincoln - McCook - Marshall - Meade - Miner - Pennington - Roberts - Sanborn - Shannon - Turner - Union - Yankton