Pierre Shale (SDKp;0)

Blue-gray to dark-gray, fissile to blocky shale with persistent beds of bentonite, black organic shale, or light-brown chalky shale. Contains minor sandstone, conglomerate, and abundant carbonate and ferruginous concretions. Thickness 1,000-2,700 ft (305-823 m).

State	South Dakota
Name	Pierre Shale
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous-Late
Original map label	Kp
Primary rock type	shale
Secondary rock type	clay or mud
Other rock types	sandstone; conglomerate
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed) Minor Sedimentary > Clastic > Conglomerate (Bed) Sedimentary > Clastic > Sandstone (Bed)
Map 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
Unit 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
Geographic coverage	Bon Homme - Brown - Brule - Buffalo - Butte - Campbell - Charles Mix - Corson - Custer - Day - Dewey - Edmunds - Fall River - Gregory - Haakon - Harding - Hughes - Hyde - Jackson - Jerauld - Jones - Lyman - McPherson - Marshall - Meade - Mellette - Pennington - Potter - Shannon - Stanley - Sully - Todd - Tripp - Walworth - Yankton - Ziebach