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Geology and pegmatites of part of the Fourmile area, Custer County, South Dakota

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A.J. Lang Jr., and J.A. Redden, 1952, Geology and pegmatites of part of the Fourmile area, Custer County, South Dakota: Trace Elements Investigations.

Summary

The Fourmile area, Custer County, S. Dak., is in pre-Cambrian metamorphic rocks that surround the granitic core of the Black Hills. The area is on the upright limb of an overturned anticline that plunges about 30° S. 10° E. Three new formations of metamorphic rocks are described that have a total thickness of at least 7, 700 feet. The oldest of these formations, the Ruby Creek quartz-mica schist, is more than 6,500 feet thick. The overlying Raver formation, about 200 feet thick, is composed of thin beds of amphibolite and hornblende schist, lime-silicate rock, cordierite-biotite schist, microcline-biotite schist, and other types of rock. The youngest formation, the Ruddock quartz-mica-feldspar schist, is more than 1,000 feet thick. [...]

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Type Scheme Key
local-index unknown tei155
local-pk unknown 70159220
series unknown Trace Elements Investigations

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journalTrace Elements Investigations
languageEnglish
citationTypeReport

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