Arikaree Group (NETa;0)

Consists mainly of gray, fine, loose to compact sand that has layers of hard, fine-grained dark-gray concretions which vary from few in to 15 in and often have tabular form. Includes a large amount of volcanic ash mixed in with the sand. Contains a number of channels filled with coarse conglomerate along ridge south of North Platte River. About 500 ft thick.

State	Nebraska
Name	Arikaree Group
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Oligocene Miocene
Original map label	Ta
Comments	Includes in decending order: Monroe Creek and Sharps FMs.
Primary rock type	sand
Secondary rock type	volcanic ash
Other rock types	conglomerate
Lithologic constituents	Major Unconsolidated > Coarse-detrital > Sand (Bed) Minor Sedimentary > Clastic > Conglomerate (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. Darton, N. H., 1899, Preliminary report on the geology and water resources of Nebraska west of the one hundred and third meridian: U.S Geological Survey, 19th Annual Report, p. 721-785. [http://pubs.er.usgs.gov/publication/ar19]
Geographic coverage	Banner - Box Butte - Cherry - Dawes - Morrill - Scotts Bluff - Sheridan - Sioux