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Kootenai formation and associated rocks

Kootenai formation and associated rocks: conglomerate, sandstone, shale, and mudstone; purplish and green beds are common; mainly the Kootenai; in southern Montana includes strata that have been mapped as Cloverly formation. Includes Second Cat Creek and Third Cat Creek sands of drillers in central part of State; Sunburst sand of drillers in north-central part; and Cut Bank sand of drillers in western part. As here mapped, may locally include thin units of Jurassic age.
StateMontana
NameKootenai formation and associated rocks
Geologic agePhanerozoic | Mesozoic | Jurassic Cretaceous-Early
Original map labelKk
Primary rock typemedium-grained mixed clastic
Secondary rock typemudstone
Other rock typeslimestone
Lithologic constituents
Major
Sedimentary > Clastic > Mixed-clastic > Conglomerate-sandstone (Bed)
Minor
Sedimentary > Clastic > Mudstone (Bed)
Incidental
Sedimentary > Carbonate > Limestone (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
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.
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.
Tilling, R.I., 1974, Composition and time relations of plutonic and associated volcanic rocks, Boulder batholith region: Geological Society of America Bulletin, v. 84, p. 1925-1930.
Tysdal, R.G., Dyman, T.S. and Nichols, D.J., 1989, Correlation chart of Lower Cretaceous rocks, Madison Range to Lima Peaks area, southwestern Montana: U.S. Geological Survey Miscellaneous Field Studies Map MF-2067, 15 p., 1 sheet.
Roberts, A.E., 1965, Correlation of Cretaceous and lower Tertiary rocks near Livingston, Montana with those in other areas in Montana and Wyoming, in Geological Survey research 1965: U.S. Geological Survey Professional Paper 525-B, p. B54-B63
DeCelles, P.G., 1986, Sedimentation in a tectonically partitioned, nonmarine foreland basin--The Lower Cretaceous Kootenai Formation, southwestern Montana: Geological Society of America Bulletin, v. 97, no. 8, p. 911-931.
Mudge, M.R. and Rice, D.D., 1982, Lower Cretaceous Mount Pablo Formation, northwestern Montana, in Contributions to stratigraphy: U.S. Geological Survey Bulletin 1502-D, p. D1-D19.
Geographic coverageBeaverhead - Big Horn - Blaine - Broadwater - Carbon - Cascade - Chouteau - Deer Lodge - Fergus - Flathead - Gallatin - Glacier - Golden Valley - Granite - Jefferson - Judith Basin - Lewis and Clark - Liberty - Madison - Meagher - Musselshell - Park - Petroleum - Phillips - Pondera - Powell - Silver Bow - Stillwater - Sweet Grass - Teton - Wheatland - Yellowstone

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