Pierre Shale

Mostly medium to dark-gray, brownish-gray, and black, fissle clay shale. Locally grades to thin beds of calcareous, silty shale or claystone, marl, shaly sandstone, and sandy shale. Locally contains thin seams of gypsum and sparse selenite crystals. Approx. max thickness 1970 ft.
State Nebraska
Name Pierre Shale
Geologic age Late Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)
Incidental
Sedimentary > Chemical > Evaporite > Gypsum (Bed)
Comments Montana Group
References
NGMDB product
Counties Adams - Antelope - Boyd - Brown - Buffalo - Cedar - Dawes - Dundy - Franklin - Frontier - Furnas - Gosper - Hall - Harlan - Hayes - Hitchcock - Holt - Howard - Kearney - Keya Paha - Knox - Merrick - Nance - Pierce - Red Willow - Rock - Sheridan - Sioux - Webster