Eagle sandstone (MTKeu;0)

State	Montana
Name	Eagle sandstone
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous-Late
Original map label	Keu
Comments	This map unit (Keu) describes the upper unit of the Eagle sandstone.
Primary rock type	sandstone
Secondary rock type	mudstone
Other rock types	coal
Lithologic constituents	Major Sedimentary > Clastic > Sandstone > Arkose (Bed) Minor 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	Roberts, A.E., 1972, Cretaceous and early Tertiary depositional and tectonic history of the Livingston area, southwestern Montana, in Geology of the Livingston area, southwestern Montana: U.S. Geological Survey Professional Paper 526-C, p. C1 [http://pubs.er.usgs.gov/publication/pp526C] Van Gosen, B.S., Elliott, J.E., LaRock, E.J., du Bray, E.A., Carlson, R.R., and Zientek, M.L., 2000, Generalized geologic map of the Absaroka-Beartooth study area, south-central Montana: U.S. Geological Survey Miscellaneous Field Studies Map MF-2338, sca [http://pubs.er.usgs.gov/publication/mf2338] Berg, R.B., Vuke, S.M., 2002, Geologic map of the Fort Benton 30' x 50' quadrangle: Montana Bureau of Mines and Geology Open File Report 460, 7 p., scale 1:100,000. du Bray, E.A., Elliott, J.E., Van Gosen, B.S., LaRock, E.J., and West, A.W., 1994, Reconnaissance geologic map of the Sliderock Mountain area, Sweet Grass and Stillwater Counties, Montana: U.S. Geological Survey Miscellaneous Field Studies Map MF-2259, 1 [http://pubs.er.usgs.gov/publication/mf2259] Vuke, S.M., Berg, R.B., Colton, R.B., O'Brien, H.E., 2002, Geologic map for the Belt 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open File Report 450, 16 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. 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] 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. Lopez, D.A., 2000, Geologic map of the Billings 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Geologic Map 59, scale 1:100,000. Fraser, G.D., Waldrop, H.A. and Hyden, H.J., 1969, Geology of the Gardiner area, Park County, Montana: U.S. Geological Survey Bulletin 1277, 118 p. [http://pubs.er.usgs.gov/publication/b1277] Wilde, E.M., and Porter, K.W., 2000, Geologic map of the Roundup 30' X 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open File Report 404, scale 1:100,000. Porter, K.W., and Wilde, E.M, 1999, Geologic map of the Musselshell 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open File Report 386, 13 p., scale 1;100,000.
Geographic coverage	Big Horn - Blaine - Carbon - Cascade - Chouteau - Fergus - Gallatin - Garfield - Golden Valley - Hill - Judith Basin - Lewis and Clark - Liberty - Madison - Meagher - Musselshell - Park - Petroleum - Phillips - Rosebud - Stillwater - Sweet Grass - Toole - Wheatland - Yellowstone