|Geologic age||Miocene to Oligocene|
Igneous > Volcanic (Pyroclastic-air fall)Includes a large amount of volcanic ash mixed in with the sand
Unconsolidated > Coarse-detrital > Sand (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
|Comments||Includes in decending order: Monroe Creek and Sharps FMs.|
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.
|Counties||Banner - Box Butte - Cherry - Dawes - Morrill - Scotts Bluff - Sheridan - Sioux|