Pierre Shale (NEKp;0)

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	Phanerozoic \| Mesozoic \| Cretaceous-Late
Original map label	Kp
Comments	Montana Group
Primary rock type	shale
Secondary rock type	evaporite
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed) Incidental Sedimentary > Chemical > Evaporite > Gypsum (Bed)
Map references	Burchett, R. R., 1986, Geologic Bedrock Map of Nebraska: Nebraska Geological Survey. Scale 1:1 Million.
Unit references	Burchett, R. R., 1986, Geologic Bedrock Map of Nebraska: Nebraska Geological Survey. Scale 1:1 Million. Eversoll, D. A., Dreeszen, V. H., Burchett, R. R., and Prichard, G. E., 1988, Bedrock Geologic Map Showing the Bedrock Surface, McCook 1x2 Quad, Nebraska and Kansas, and Part of the Sterling 1x2 Quad, Nebraska and Colorado: USGS Map I-1878. Scale 1:250K
Geographic coverage	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