Skip to Main Content
Book Chapter

Surficial Deposits of Yucca Flat Area, Nevada Test Site

By
Arthur T. Fernald
Arthur T. Fernald
Search for other works by this author on:
George S. Corchary
George S. Corchary
Search for other works by this author on:
William P. Williams
William P. Williams
Search for other works by this author on:
Roger B. Colton
Roger B. Colton
Search for other works by this author on:
Published:
January 01, 1968

Yucca Flat, an intermontane basin and piedmont area, is underlain principally by a series of coalescing fans of two types: (1) colluvial-alluvial fans, developed where minor streams emerge from the mountains; and (2) alluvial fans formed by major streams. Colluvial-alluvial fans consist of rubble or rubble mixed with gravel; their lithology reflects closely the adjacent bedrock, and in places they merge upslope into talus. Alluvial fans consist largely of coarse gravel on the piedmont but become finer-grained in the lowland, where they grade into the playa deposits of Yucca Lake. Chronologically, most of the fans are of Recent age, but some terraces and dissected fans are probably late Pleistocene in age. Older deposits, of Tertiary and Quaternary age, consist of thick fanglomerates in some places, and thin pediment deposits in other places; collectively, they contain boulder- to pebble-sized gravel, rubble, and sand. Locally, the fanglomerates consist of well-rounded gravel derived from Paleozoic rocks and angular rubble from Tertiary volcanics. The fanglomerates are now deeply dissected, but their distribution indicates that broad fan aprons once bordered the mountains.

You do not currently have access to this article.

Figures & Tables

Contents

GSA Memoirs

Nevada Test Site

Edwin B. Eckel
Edwin B. Eckel
Editor
Search for other works by this author on:
Geological Society of America
Volume
110
ISBN print:
9780813711102
Publication date:
January 01, 1968

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal