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Pierre Shale

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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
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 > Sandstone (Bed)
Sedimentary > Clastic > Conglomerate (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
Counties Bon Homme - Brule - Buffalo - Butte - Campbell - Charles Mix - Corson - Custer - Day - Dewey - Edmunds - Fall River - Gregory - Haakon - Harding - Hughes - Jackson - Jerauld - Jones - Lyman - McPherson - Marshall - Meade - Mellette - Pennington - Shannon - Stanley - Sully - Todd - Tripp - Walworth - Yankton - Ziebach