White River Group

Clay, some claystone, silt and siltstone. Predominantly greenish gray and volcaniclastic. Other occurrences are greenish gray to white and bentonitic. Local channel sandstone at base. Aprox thickness 195 ft.
State Nebraska
Name White River Group
Geologic age Oligocene
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Bed)
Minor
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Unconsolidated > Fine-detrital > Silt (Bed)
Comments Includes Chadron FM and overlying Brule FM.
References
NGMDB product
Counties Banner - Box Butte - Brown - Cherry - Cheyenne - Dawes - Deuel - Garden - Keith - Keya Paha - Kimball - Knox - Morrill - Red Willow - Scotts Bluff - Sheridan - Sioux