Flaxville gravel (MTTf;0)

State	Montana
Name	Flaxville gravel
Geologic age	Phanerozoic \| Cenozoic \| Tertiary
Original map label	Tf
Primary rock type	coarse-grained mixed clastic
Secondary rock type	silt
Other rock types	volcanic ash
Lithologic constituents	Major Sedimentary > Clastic > Mixed-clastic (Bed)Contains pebbles, large cobbles, clay, and sand. Minor Igneous > Volcanic (Pyroclastic, air fall)Volcanic ash beds. Sedimentary > Carbonate > Marlstone (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	Colton, R.B., 1962, Geology of the Otter Creek quadrangle, Montana, in Contributions to general geology, 1959: U.S. Geological Survey Bulletin 1111-G, p. G237-G288. [http://pubs.er.usgs.gov/publication/b1111G] Collier, A.J. and Thom, W.T., Jr., 1918, The Flaxville Gravel and its relations to other terrace gravels of the Northern Great Plains, in Shorter contributions to general geology, 1917: U.S. Geological Survey Professional Paper 108-J, p. 179- [http://pubs.er.usgs.gov/publication/pp108J] 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]
Geographic coverage	Blaine - Daniels - Dawson - Phillips - Prairie - Richland - Roosevelt - Sheridan - Valley