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Elkhorn Mountains Volcanics

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Light gray to dark gray, grayish red, greenish gray, and brown mostly andesitic to latitic welded tuff and tuff breccia, tuff, lapilli tuff, lava flows, flow breccia, and related hypabyssal intrusive rock. Subordinate quartz latitic welded tuff and basalt flows.
State Montana
Name Elkhorn Mountains Volcanics
Geologic age Cretaceous
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-tuff, Volcaniclastic-volcanic breccia, Flow)andesitic to latitic welded tuff and tuff breccia, tuff, lapilli tuff, lava flows, flow breccia
Igneous > Volcanic > Felsic-volcanic > Latite (Pyroclastic-tuff, Volcaniclastic-volcanic breccia, Flow)andesitic to latitic welded tuff and tuff breccia, tuff, lapilli tuff, lava flows, flow breccia
Minor
Igneous > Hypabyssalrelated hypabyssal intrusive rock
Igneous > Volcanic > Felsic-volcanic > Quartz-latite (Pyroclastic-tuff)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
References

Vuke, S.M., Porter, K.W., Lonn, J.D., and Lopez, D.A., 2007, Geologic Map of Montana - Compact Disc: Montana Bureau of Mines and Geology: Geologic Map 62-C, 73 p., 2 sheets, scale 1:500,000. This map was digitized in 2012 as a result of a contract between the U.S. Geological Survey and the Montana Bureau of Mines and Geology.
NGMDB product
Counties Broadwater - Deer Lodge - Jefferson - Lewis and Clark - Madison - Powell