Greenhorn Limestone and Graneros Shale (NEKgg;0)

Greenhorn Limestone and Graneros Shale

Greenhorn Limestone- medium- to light-gray limestone interbedded with argillaceous limestone, marl and calcareous shale; contains Inoceramus fossils. Upper and lower contacts gradational. Approx. max thickness 30 ft. Graneros Shale- medium- to dark-gray, partly calcareous shale. Interbeds of siltstone, sandstone, and carbonaceous shale, and thin bentonite layers in upper part. Approx. max thickness 60 ft.

State	Nebraska
Name	Greenhorn Limestone and Graneros Shale
Geologic age	Late Cretaceous
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Calcareous) Sedimentary > Carbonate > Limestone (Bed) Minor Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Siltstone (Bed) Incidental Sedimentary > Carbonate > Marlstone (Bed)
Comments	Colorado Group
References	Burchett, R.R., 1986, Geologic Bedrock Map of Nebraska: Nebraska Geological Survey. Scale 1:1 million. Burchett, R.R., Dreeszen, V.H., Souders, V.L., and Prichard, G.E., 1988, Bedrock Geologic Map Showing the Bedrock Surface in the Nebraska Part of the Sioux City 1x2 Quad.: USGS Map I-1879. Scale 1:250 K. https://pubs.er.usgs.gov/publication/i1879
NGMDB product	NGMDB product page for 39227
Counties	Burt - Butler - Cedar - Clay - Colfax - Cuming - Dakota - Dawes - Dixon - Dodge - Fillmore - Jefferson - Lancaster - Nuckolls - Polk - Saline - Saunders - Seward - Thayer - Thurston - York

Greenhorn Limestone and Graneros Shale

Burchett, R.R., 1986, Geologic Bedrock Map of Nebraska: Nebraska Geological Survey. Scale 1:1 million.

Burchett, R.R., Dreeszen, V.H., Souders, V.L., and Prichard, G.E., 1988, Bedrock Geologic Map Showing the Bedrock Surface in the Nebraska Part of the Sioux City 1x2 Quad.: USGS Map I-1879. Scale 1:250 K.