White River formation (MTTwr;0)

State	Montana
Name	White River formation
Geologic age	Phanerozoic \| Cenozoic \| Tertiary
Original map label	Twr
Primary rock type	claystone
Secondary rock type	sandstone
Other rock types	limestone
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Claystone (Bed) Minor Sedimentary > Clastic > Sandstone > Arkose (Bed) Incidental Sedimentary > Carbonate > Limestone (Bed)
Map references	Ross, P.R., Andrews, D.A., and Witkind, I.J., 1955, Geologic map of Montana: U.S. Geological Survey, 2 sheets, scale 1:500,000.
Unit references	Denson, N.M., and Gill, J.R., 1965, Uranium-bearing lignite and carbonaceous shale in the southwestern part of the Williston Basin--A regional study: U.S. Geological Survey Professional Paper 463, 75 p., 19 plates. [http://pubs.er.usgs.gov/publication/pp463] Roberts, A.E., 1972, Cretaceous and early Tertiary depositional and tectonic history of the Livingston area, southwestern Montana, in Geology of the Livingston area, southwestern Montana: U.S. Geological Survey Professional Paper 526-C, p. C1 [http://pubs.er.usgs.gov/publication/pp526C]
Geographic coverage	Carter