Basal part of Cody shale (MTKcb;0)

State	Montana
Name	Basal part of Cody shale
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous-Late
Original map label	Kcb
Primary rock type	shale
Secondary rock type	sandstone
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed) Minor Sedimentary > Clastic > Sandstone (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	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 Richards, P.W. and Rogers, C.P., Jr., 1951, Geology of the Hardin area, Big Horn and Yellowstone Counties, Montana: U.S. Geological Survey Oil and Gas Investigations Map OM-111, 2 sheets, scale 1:63,360 (Reprinted 1975). [http://pubs.er.usgs.gov/publication/om111] Vuke, S.M., Wilde, E.M., Lopez, D.A., and Bergantino, R.N., 2000, Geologic map of the Lodge Grass 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Geologic Map 56, scale 1:100,000. Vuke, S.M., Wilde, E.M., and Bergantino, R.N., 1999, Geologic map of the Hardin 30' x 60' quadrangle, eastern Montana, revised 1999: Montana Bureau of Mines and Geology Open File Report 392, 9 p., scale 1;100,000. Richards, P.W., 1955, Geology of the Bighorn Canyon-Hardin area, Montana and Wyoming: U.S. Geological Survey Bulletin 1026, 96 p., (incl. geologic map, scale 1:62,500). [http://pubs.er.usgs.gov/publication/b1026]
Geographic coverage	Big Horn - Carbon - Yellowstone