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Cambrian, undifferentiated

Cambrian, undifferentiated: comprises Deadwood formation, in south-central Montana, and Red Lion formation, Dry Creek shale, Hasmark formation, Pilgrim limestone, Silver Hill formation, Park shale, Meagher limestone, Wolsey shale, Flathead quartzite, and other units. In a few places quartzite of Cambrian age may be mapped with the Belt series or quartzite of Belt age with the Cambrian rocks.
StateMontana
NameCambrian, undifferentiated
Geologic agePhanerozoic | Paleozoic | Cambrian
Original map labelCu
Primary rock typecarbonate
Secondary rock typemudstone
Other rock typessandstone; conglomerate
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Carbonate (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Clastic > Conglomerate (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
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
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.
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.
Lewis, R.S., 1998, Preliminary geologic map of the Butte 1° x 2° quadrangle: Montana Bureau of Mines and Geology Open File Report 363, 16 p, scale 1:250,000.
Ruppel, E.T., 1998, Geologic map of the eastern part of the Leadore 30' x 60' quadrangle, Montana and Idaho: Montana Bureau of Mines and Geology Open File Report 372, 9 p., scale 1:100,000.
Tysdal, R.G., Ludington, Steve, and McCafferty, A.E., 1996, Mineral and energy resource assessment of the Helena National Forest, west-central Montana: U.S. Geological Survey Open-File Report 96-683-A, 322 p., 6 plates.
Sears, J.W., 1985, Middle Eocene tuff from the Missoula basin, west-central Montana: Northwest Geology, v. 14, p. 33-36.
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.
Wilson, A.B., and Elliott, J.E., 1997, Geologic maps of western and northern parts of Gallatin National Forest, south-central Montana: U.S. Geological Survey Geologic Investigations Series Map I-2584, 2 sheets, scale 1:126,720.
Mudge, M.R., Earhart, R.L., 1983, Geologic and structure maps of the Choteau 1° x 2° quadrangle, western Montana: United States Geological Survey Miscellaneous Geologic Investigations Series Map I-1300, scale 1:250,000.
Harrison, J.E., Whipple, J.W., and Lidke, D.J., 1998, Geologic map of the western part of the Cut Bank 1° x 2° quadrangle, northwestern Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Series Map I-2593, scale 1:250,000.
Mudge, M.R., and Earhart, R.L., 1983, Bedrock geologic map of part of the northern disturbed belt, Lewis and Clark, Teton, Pondera, Glacier, Flathead, Cascade and Powell Counties, Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Seri
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.
Lopez, D.A., 2000, Geologic map of the Bridger 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Geologic Map 58, scale 1:100,000.
Robinson, G.D. and Barnett, H.F., 1963, Geology of the Three Forks quadrangle, Montana, with sections on petrography of igneous rocks by H.F. Barnett: U.S. Geological Survey Professional Paper 370, 143 p.
Blackstone, D.L., Jr., 1975, Geology of the East Pryor Mountain quadrangle, Carbon County, Montana: Montana Bureau of Mines and Geology Special Publication 69, 13 p., 1 plate, scale 1:24,000.
Kellogg, K.S., and Williams, V.S., 2000, Geologic map of the Ennis 30' x 60' quadrangle, Madison and Gallatin Counties, Montana, Park County, Wyoming: U.S. Geological Survey Miscellaneous Geologic Investigations Series Map I-2690, scale 1:100,000.
Lonn, J., 2000, Geologic map of the Lima 30' x 60' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Open File Report 408, 12 p., scale 1:100,000.
Porter,K.W., Wilde, E.M., and Vuke, S.M., 1999, The preliminary geologic map of the Big Snowy Mountains 30' x 60' quadrangle, Montana, revised 1999: Montana Bureau of Mines and Geology Open File Report 341, 7 p., scale 1:100,000.
Zen, E-an, 1988, Bedrock geology of the Vipond Park 15-minute, Stine Mountain 7 1/2-minute, and Maurice Mountain 7 1/2-minute quadrangles, Pioneer Mountains, Beaverhead County, Montana: U.S. Geological Survey Bulletin 1625, 49 p., incl. geologic
Macke, D.L., 1993, Cambrian through Mississippian rocks of the Powder River basin, Wyoming, Montana, and adjacent areas, in Evolution of sedimentary basins--Powder River basin: U.S. Geological Survey Bulletin 1917-M, p. M1-M174
Sloss, L.L., and Moritz, C.A., 1951, Paleozoic stratigraphy of southwestern Montana: American Association of Petroleum Geologists Bulletin, v. 35, no. 10, p. 2135-2169
Chesson, S.A., Billodeau, W.L., and Wells, J.D., 1984, Cambrian stratigraphy of the Libby and Alberton areas, northwestern Montana, in McBane, J.D., and Garrison, P.B., eds., Northwest Montana and adjacent Canada--Montana Geological Society 1984 Field Co
Deiss, C.F., 1933, Paleozoic formations of northwestern Montana: Montana Bureau of Mines and Geology Memoir, no. 6, 51 p.
Knechtel, M.M., 1956, Emerson formation of Cambrian and probably Early Ordovician age in Little Rocky Mountains, Montana: American Association of Petroleum Geologists Bulletin, v. 40, no. 8, p. 1994-1995.
Deiss, C.F., 1939, Cambrian stratigraphy and trilobites of northwestern Montana: Geological Society of America Special Paper 18, 135 p.
Dorf, E. and Lochman, Christina, 1940, Upper Cambrian formations in southern Montana: Geological Society of America Bulletin, v. 51, no. 4, p. 541-556.
Lochman, Christina, 1950, Status of Dry Creek shale of central Montana: American Association of Petroleum Geologists Bulletin, v. 34, no. 11, p. 2200-2222.
Grant, R.E., 1965, Faunas and stratigraphy of the Snowy Range Formation (Upper Cambrian) in southwestern Montana and northwestern Wyoming: Geological Society of America Memoir 96, 171 p.
Hanson, A.M., 1952, Cambrian stratigraphy in southwestern Montana: Montana Bureau of Mines and Geology Memoir no. 33, 46 p.
Lindsey, D.A., 1980, Reconnaissance geologic map of the Big Snowies Wilderness and contiguous RARE II study areas, Fergus, Golden Valley, and Wheatland Counties, Montana: U.S. Geological Survey Miscellaneous Field Studies Map MF-1243-A, 1 sheet.
Lewis, R.S., 1998, Geologic map of the Montana part of the Missoula West 30' x 60' quadrangle: Montana Bureau of Mines and Geology Open File Report 373, 20 p, scale 1:100,000.
Geographic coverageBeaverhead - Big Horn - Blaine - Broadwater - Carbon - Cascade - Deer Lodge - Fergus - Flathead - Gallatin - Golden Valley - Granite - Jefferson - Judith Basin - Lewis and Clark - Madison - Meagher - Missoula - Park - Phillips - Pondera - Powell - Ravalli - Silver Bow - Stillwater - Sweet Grass - Teton

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