Scarberry, K.C., Elliott, C.G., and Yakovlev, P.V., 2019, Geology of the Butte North 30' x 60' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Open-File Report 715, 30 p., 1 sheet, scale 1:100,000.
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The Butte North quadrangle lies in a geologically complex area of southwestern Montana. Archean and Paleoproterozoic crystalline basement rock, Mesoproterozoic through Cretaceous metasedimentary and sedimentary rock, Cretaceous through Tertiary intrusive and volcanic rock, and Tertiary and Quaternary valley-fill and surficial deposits are all exposed in the quadrangle. The Late Cretaceous Boulder Batholith and co-magmatic Elkhorn Mountains Volcanic Field, and the Eocene-Oligocene Lowland Creek and Elliston volcanic fields are the dominant units in the quadrangle. The Boulder Batholith hosts two world-class porphyry Cu-Mo deposits, which are cut by polymetallic lode veins.
ELKHORN MOUNTAINS VOLCANIC FIELD, BOULDER BATHOLITH, LOWLAND CREEK VOLCANIC FIELD, AMACONDA METAMORPHIC CORE COMPLEX, DETACHMENT, CENOZOIC MAGMATISM, BASIN AND RANGE EXTENSION
DEER LODGE, JEFFERSON, LEWIS AND CLARK, POWELL, SILVER BOW
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