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Geology of the Three Forks quadrangle, Montana, with sections on petrography of igneous rocks

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Geology of the Three Forks quadrangle, Montana, with sections on petrography of igneous rocks; 1963; PP; 370; Robinson, G. D.; Barnett, Henry Frank

Summary

The Three Forks quadrangle at the head of the Missouri River, has a long stratigraphic succession. The oldest rocks are Precambrian gneiss, derived from arkosic sandstone, and amphibolite, probably altered from mafic sills and lava flows. The unmetamorphosed sedimentary rocks range in age from late Precambrian to Recent, have an aggregate thickness of about 11,000 feet, and underlie about 85 percent of the quadrangle. The only systems not represented are Ordovician, Silurian, and Triassic.

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Harvested on Mon Jul 21 12:39:44 MDT 2014 from MODS XML Service

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Type Scheme Key
local-index unknown pp370
local-pk unknown 6337
series unknown Professional Paper

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journalProfessional Paper
languageENGLISH
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