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Horsethief sandstone

Horsethief sandstone: shaly sandstone grading upward into massive brownish cliff-forming sandstone with local concentrations of magnetite in beds near top.
StateMontana
NameHorsethief sandstone
Geologic agePhanerozoic | Mesozoic | Cretaceous-Late
Original map labelKh
Primary rock typesandstone
Secondary rock typeconglomerate
Other rock typesshale
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Clastic > Conglomerate (Bed)
Incidental
Sedimentary > Clastic > Mudstone > Shale (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
O'Neill, J.M., Christiansen, R.L., 2002, Geologic map of the Hebgen Lake quadrangle: Montana Bureau of Mines and Geology Open File Report 464, 21 p, scale 1:100,000.
Viele, G.W. and Harris, F.G., III, 1965, Montana Group stratigraphy, Lewis and Clark County, Montana: American Association of Petroleum Geologists Bulletin, v. 49, no. 4, p. 379-417.
Stebinger, E., 1914, The Montana group of northwestern Montana: U.S. Geological Survey Professional Paper 90, p. 62-68.
Geographic coverageGlacier - Lewis and Clark - Pondera - Teton

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