Hell Creek formation (MTKhc;0)

State	Montana
Name	Hell Creek formation
Geologic age	Phanerozoic \| Mesozoic Cenozoic \| Cretaceous-Late Tertiary \| Paleocene
Original map label	Khc
Primary rock type	sandstone
Secondary rock type	mudstone
Other rock types	coal
Lithologic constituents	Major Sedimentary > Clastic > Mudstone (Bed) Sedimentary > Clastic > Sandstone (Bed) Minor 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	Ruppel, E.T., O'Neill, J.M., and Lopez, D.A., 1993, Geologic map of the Dillon 1o x 2o quadrangle, Idaho and Montana: U.S. Geological Survey Miscellaneous Investigations Series Map I-1803-H, scale 1:250,000. [http://pubs.er.usgs.gov/publication/i1803H] Nichols, D.J. and Brown, J.L., 1992, Palynostratigraphy of the Tullock Member (lower Paleocene) of the Fort Union Formation in the Powder River basin, Montana and Wyoming, in Evolution of sedimentary basins--Powder River basin: U.S. Geological 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] Rigby, J.K. and Rigby, J.K., Jr., 1990, Geology of the Sand Arroyo and Bug Creek quadrangles, McCone County, Montana: Brigham Young University Geology Studies, v. 36, p. 69-134.
Geographic coverage	Big Horn - Blaine - Carbon - Carter - Chouteau - Custer - Daniels - Dawson - Fallon - Fergus - Garfield - Golden Valley - Lewis and Clark - McCone - Musselshell - Petroleum - Phillips - Powder River - Prairie - Richland - Roosevelt - Rosebud - Stillwater - Sweet Grass - Treasure - Valley - Wheatland - Wibaux - Yellowstone