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New!  Geologic map of the Ruby Valley School Quadrangle, Elko county, Nevada
Geologic map of the Ruby Valley School Quadrangle, Elko county, Nevada
 
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Product Code: M194

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Title: Geologic Map of the Ruby Valley School Quadrangle, Elko County, Nevada

Author: Keith A. Howard
Year: 2024
Format: 1 sheet; Text, 9 pages
Series: Map 194
Scale: 1:24,000

The quadrangle holds parts of the east flank of the Ruby Mountains and adjacent Ruby Valley. The mountains expose some of the Ruby Mountains-East Humboldt Range metamorphic core complex. It here contains Neoproterozoic to Ordovician marble and quartzite metamorphosed to amphibolite facies (sillimanite zone) and intruded by countless Cretaceous and Paleogene granite sills and dikes. The metamorphosed strata define a southeastward widening synclinal complex between diverging exposures (outside the quadrangle) of two anticlines: the east-facing Lamoille Canyon fold nappe and the upright Hidden Lakes uplift. Foliations, mesoscopic folds, and lineations in this infrastructure imply that southerly-plunging recumbent folding dominates the synclinal complex. Subsurface and geophysical data indicate that Paleozoic to Neogene unmetamorphosed strata downfaulted from higher crustal levels underlie Ruby Valley in the east side of the quadrangle. The Ruby Valley fault at the range front of the Ruby Mountains displaces Pleistocene pediments and a possibly pre-Lamoille moraine. The Ruby Mountains form the most glaciated range in Nevada, sculpted most recently by the late Pleistocene Lamoille and Angel Lake glaciations that provided meltwater to pluvial Lake Franklin in Ruby Valley.

Suggested Citation: Howard, K.A., 2024, Geologic map of the Ruby Valley School quadrangle, Elko County, Nevada: Nevada Bureau of Mines and Geology Map 194, scale 1:24,000, 9 p.

Original Product Code: M194