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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 47 (1963)

Issue: 5. (May)

First Page: 814

Last Page: 822

Title: Late Precambrian Metasedimentary Rocks of Egan Range, Nevada

Author(s): Lee A. Woodward (2)


Approximately 8,450 feet of polymetamorphic Late Precambrian strata are exposed at Heusser Mountain in the central northern Egan Range, Nevada. These rocks were regionally metamorphosed to slates, argillites, phyllites, metasiltstones, and quartzites; they were later contact-metamorphosed to grades as high as the biotite-zone by a quartz monzonite intrusion.

Described herein are seven conformable formations (lettered B through H). They seem to correlate fairly well lithologically with units described by Misch and Hazzard (1962) from the Snake and Schell Creek Ranges, and by Fritz (1960) from the northern Egan Range. Regional relations between the Precambrian rocks and the Lower Cambrian Prospect Mountain Quartzite (Restricted) suggest a disconformity at the top of the Precambrian section.

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