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Judith River formation

Judith River formation: light-colored sandstone at top; lower third somber-gray siltstone and sandy shale; greenish-gray clay and some lignite beds; includes the Parkman sandstone member of south-central Montana.
StateMontana
NameJudith River formation
Geologic agePhanerozoic | Mesozoic | Cretaceous-Late
Original map labelKjr
Primary rock typesandstone
Secondary rock typemudstone
Other rock typescoal
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
Bergantino, R., Porter, K.W., 2002, Geologic map of the Rocky Boy 30'x 60' map: Montana Bureau of Mines and Geology Open File Report 451, 16 p, scale 1:100,000.
Trombetta, J.T., 1987, Evolution of the Eocene Avon volcanic complex, Powell County, Montana: Bozeman, Montana State University, M.S. thesis, 97 p.
Porter, K.W., Wilde, E.M., 1993, Preliminary geologic map of the Lewistown 30' x 60' quadrangle, revised 1999: Montana Bureau of Mines and Geology Open File Report 308, 22 p, scale 1:100,000.
Lopez, D.A., 2001, Geologic map of the Sweet Grass Hills 30' x 60' quadrangle, north-central Montana: Montana Bureau of Mines and Geology Open File Report 443, 4 p., scale 1:100,000.
Porter, K.W., Wilde, E.M., 2001, Geology of the Winifred 30' x 60' quadrangle, eastern Montana: Montana Bureau of Mines and Geology Open File Report 437, scale 1:100,000.
Knechtel, M.M. and Patterson, S.H., 1956, Bentonite deposits in marine Cretaceous formations, Hardin district, Montana and Wyoming: U.S. Geological Survey Bulletin 1023, 116 p.
Bergantino, R.N., 2001, Geologic map of the Dodson 30' x 60' quadrangle, eastern Montana: Montana Bureau of Mines and Geology Open File Report 439, scale 1:100,000.
Lopez, D.A., 2001, Geologic map of the Chester 30' x 60' quadrangle, north-central Montana: Montana Bureau of Mines and Geology Open File Report 445, 4 p., scale 1:100,000.
Lopez, D.A., 2002, Geologic map of the Lonesome Lake 30' x 60' quadrangle, north-central Montana: Montana Bureau of Mines and Geology Open File Report 446, 4 p., scale 1:100,000.
Geographic coverageBig Horn - Blaine - Carbon - Chouteau - Fergus - Garfield - Golden Valley - Hill - Liberty - Meagher - Musselshell - Park - Petroleum - Phillips - Rosebud - Stillwater - Sweet Grass - Toole - Treasure - Valley - Wheatland - Yellowstone

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