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Lennep sandstone

Lennep sandstone: mainly dark-brown andesitic sandstone with intercalated shale; locally contains thin coal beds.
State Montana
Name Lennep sandstone
Geologic age Phanerozoic | Mesozoic | Cretaceous-Late
Primary rock type sandstone
Secondary rock type mudstone
Other rock types coal
Lithologic constituents
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone (Bed)
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.
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.
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.
Counties Carbon - Golden Valley - Stillwater - Wheatland - Yellowstone