The Goshute Mountains and the Toano Range are segments of
a continuous mountain range in northeastern Nevada separated
only by Morgan Pass, a high divide in the central part of the
range. Our investigation extends from White Horse Pass, 32 km
south of Morgan Pass, to Silver Zone Pass, almost 32 km north
of Morgan Pass (fig. 1). This segment is herein termed the Goshute-Toano
Range. The Goshute-Toano Range, as so defined, lies within a
region of Mesozoic contraction (Coats and Riva, 1983; Ketner,
1984; Thorman and others, 1991) and Mesozoic to Tertiary extension
(Hodges and Walker, 1992).
Our investigation began in 1984 as an effort sponsored by
the U.S. Bureau of Land Management to assess the mineral potential
of the Bluebell and Goshute Peak Wilderness Study Areas, which
occupy much of the Goshute-Toano Range. That task, which involved
mapping the entire range between White Horse and Silver Zone
Passes, was completed in 1986. Recently, part of the mapped area
was revised in an attempt to understand more fully the basic
features of the structural and igneous history. The geology of
large parts of the Goshute-Toano Range was described previously
(Day and others, 1987; Ketner 1987; Ketner and others, 1987).
The geology north of Silver Zone Pass was mapped and described
by Glick (1987); the area immediately south of the pass within
the Silver Zone Pass quadrangle was mapped by D.M. Miller (unpub.
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