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Virgin Valley Opal District, Humboldt County, Nevada
From abstract: Numerous discontinuous layers of opal are interbedded with a gently-dipping series of vitric tuff and ash which is at least 300 feet thick. The tuff and ash are capped by a dark, vesicular basalt in the eastern part of the area and by a thin layer of terrace gravels in the area along the west side of Virgin Valley.
Date:
May 1951
Creator:
Staatz, Mortimer Hay & Bauer, Herman L., Jr.
System:
The UNT Digital Library