Lennep sandstone (MTKl;0)

State	Montana
Name	Lennep sandstone
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous-Late
Original map label	Kl
Primary rock type	sandstone
Secondary rock type	mudstone
Other rock types	coal
Lithologic constituents	Major Sedimentary > Clastic > Mudstone (Bed) Sedimentary > Clastic > Sandstone (Bed) Incidental Sedimentary > Coal (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	Vuke, S.M., 2000, Geologic map of the Great Falls South 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open File Report 407, scale 1:100,000. Gill, J.R. and Cobban, W.A., 1973, Stratigraphy and geologic history of Montana Group and equivalent rocks, Montana, Wyoming, and North and South Dakota: U.S. Geological Survey Professional Paper 776, 37 p. [http://pubs.er.usgs.gov/publication/pp776] Skipp, Betty and McGrew, L.W., 1977, The Maudlow and Sedan Formations of the Upper Cretaceous Livingston Group at the west edge of the Crazy Mountains basin, Montana, in Contributions to stratigraphy: U.S. Geological Survey Bulletin 1422-B, p. [http://pubs.er.usgs.gov/publication/b1422B] Stone, R.W. and Calvert, W.R., 1910, Stratigraphic relations of the Livingston formation of Montana, Part III: Economic Geology, v. 5, no. 8, p. 741- 764.
Geographic coverage	Carbon - Golden Valley - Stillwater - Sweet Grass - Wheatland - Yellowstone