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Newland limestone

Newland limestone: dark bluish-gray argillaceous, dolomitic limestone with some argillite, locally schistose; segregation structures not conspicuous. In central and western Montana the Newland and Wallace formations have been treated as essentially synonymous terms by some authors.
StateMontana
NameNewland limestone
Geologic ageProterozoic | Mesoproterozoic
Original map labelpCn
Primary rock typecarbonate
Secondary rock typemeta-argillite
Other rock typesquartzite
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Argillite (Greenschist)
Sedimentary > Carbonate > Limestone (Bed)Weakly metamorphosed limestone and dolomitic limestone
Incidental
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Greenschist)
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
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.
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.
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.
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.
McGill, G.E., and Sommers, D.A., 1967, Stratigraphy and correlation of the Precambrian Belt Supergroup of the southern Lewis and Clark Range, Montana: Geological Society of America Bulletin, v. 78, no. 3, p. 343-351.
Harrison, J.E., 1972, Precambrian Belt basin of northwestern United States--Its geometry, sedimentation and copper occurrences: Geological Society of America Bulletin, v. 83, no. 5, p. 1215-1240.
McMannis, W.J., 1963, LaHood Formation--A coarse facies of the Belt Series in southwestern Montana: Geological Society of America Bulletin, v. 74, no. 4, p. 407-436.
Skipp, Betty, and Peterson, A.D., 1965, Geologic map of the Maudlow quadrangle, southwestern Montana: U.S. Geological Survey Miscellaneous Investigations Series Map I-452, 2 sheets, scale 1:24,000.
O'Neill, M.J., 1995, Table Mountain Quartzite and Moose Formation (new names) and associated rocks of the Middle Proterozoic Belt Supergroup, Highland Mountains, southwestern Montana, in O'Neill, J.M., and Pearson, R.C., eds., Belt Supergroup
Horodyski, R.J., 1980, Middle Proterozoic shale-facies microbioata from the lower Belt Supergroup, Little Belt Mountains, Montana: Journal of Paleontology, v. 54, no. 4, p. 649-663.
Feeback, D.L., 1997, Stratigraphy and sedimentation of the Chamberlain Formation-Newland Formation boundary, lower Belt Supergroup (middle Proterozoic), central Montana: Missoula, University of Montana, M.S. thesis, 77 p.
Godlewski, D.W., and Zieg, G.A., 1984, Statigraphy and depostional setting of the Precambrian Newland Limestone, in Hobbs, S.W., ed., The Belt--Abstracts with summaries, Belt Sympsium II, 1983: Montana Bureau of Mines and Geology Special Publication 90,
Keefer, W.R., 1972, Geologic of the west half of the Neihart 15-minute quadrangle, central Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-726, scale 1:62,500.
Geographic coverageBroadwater - Deer Lodge - Granite - Lewis and Clark - Meagher - Missoula - Powell - Ravalli

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