Mowry Shale, Newcastle Sandstone, and Skull Creek Shale (SDKms;0)

Mowry Shale, Newcastle Sandstone, and Skull Creek Shale

Mowry Shale- Black to gray, siliceous, fissile shale and siltstone containing bentonite layers, and sparse sandstone dikes and sills. Thickness 125-250 ft (38-76 m). Newcastle Sandstone- Gray, light-brown to yellow, discontinuously distributed siltstone, claystone, sandy shale, and fine-grained sandstone. Thickness up to 290 ft (88 m). Skull Creek Shale- Dark-gray to blueish-gray shale containing ferruginous, and carbonate concretions. Thickness 150-275 ft (46-84 m).

State	South Dakota
Name	Mowry Shale, Newcastle Sandstone, and Skull Creek Shale
Geologic age	Early Cretaceous
Lithologic constituents	Major Sedimentary > Clastic > Siltstone (Bed) Sedimentary > Clastic > Mudstone > Shale (Bed) Minor Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Mudstone > Claystone (Bed)
References	Martin, J.E., Sawyer, J.F., Fahrenbach, M.D., Tomhave, D.W., and Schulz, L.D., 2004, Geologic Map of South Dakota: South Dakota Geological Survey, GM 10, scale 1:500,000.
NGMDB product	NGMDB product page for 72317
Counties	Butte - Custer - Fall River - Lawrence - Meade - Pennington

Mowry Shale, Newcastle Sandstone, and Skull Creek Shale

Martin, J.E., Sawyer, J.F., Fahrenbach, M.D., Tomhave, D.W., and Schulz, L.D., 2004, Geologic Map of South Dakota: South Dakota Geological Survey, GM 10, scale 1:500,000.