State | South Dakota |
---|---|
Name | Greenhorn Formation |
Geologic age | Upper Cretaceous |
Lithologic constituents |
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Carbonate > Marlstone (Bed)
Sedimentary > Clastic > Mudstone (Bed)
Minor
Sedimentary > Carbonate > Limestone (Bed)Shaly limestone grading upward into light-gray to tan, alternating marl and thin-bedded, fossiliferous limestone.
Sedimentary > Clastic > Sandstone > Arenite > Calcarenite (Bed)
|
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 | Butte - Clay - Custer - Fall River - Grant - Hutchinson - Lawrence - Lincoln - Meade - Pennington - Roberts - Turner - Union - Yankton |