Public Release: 

Unusual central Nevada geologic terranes

New special paper from The Geological Society of America

Geological Society of America

Boulder, CO, USA - This new Special Paper from The Geological Society of America is a product of nearly 25 years of geologic investigations. It is a detailed exposition of two small areas, both less than 25 km east of the Mississippian Roberts Mountains allochthon, but each displaying a different, unique geologic terrane, previously undocumented in Nevada and perhaps in North America.

One area, the Bisoni-McKay, at the south end of the Fish Creek Range, displays an olistostrome, shed eastward during the late Late Devonian (early Famennian) from an eastward-migrating Antler orogenic forebulge. The other, the Warm Springs-Milk Spring, at the south end of the Hot Creek Range, displays a deeper marine terrane affected by the early Late Devonian (middle Frasnian) Alamo impact.

New data show that the Antler orogeny began in latest Middle Devonian time, much earlier than previously thought. Detailed geologic maps support the conclusions, interpretations, and hypotheses presented in the text. The authors have identified and dated Paleozoic rock units by studying nearly 100 acid-dissolved carbonate conodont samples and at least 50 collections of conodonts on siltstone bedding planes; they also re-dated Tertiary volcanic rocks and evaluated mineral and petroleum resources.


Individual copies of the volume may be purchased through The Geological Society of America online store,, or by contacting GSA Sales and Service,

Book editors of earth science journals/publications may request a review copy by contacting April Leo,

Unusual Central Nevada Geologic Terranes Produced by Late Devonian Antler Orogeny and Alamo Impact
by Forrest G. Poole and Charles A. Sandberg
Geological Society of America Special Paper 517
SPE517, 104 p. plus 2 plates; $55; GSA member price $38
ISBN 978-0-8137-2517-8

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