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Level of Lake Lahontan during Deposition of the Trego Hot Springs Tephra about 23,400 years ago

Published online by Cambridge University Press:  20 January 2017

Jonathan O. Davis
Jonathan O. Davis*
Affiliation:
Social Sciences Center, Desert Research Institute, Reno, Nevada, USA
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Abstract

The Trego Hot Springs tephra bed is a silicic tephra about 23,400 yr old, found at several localities in pluvial lake sediments in northern Nevada, southern Oregon, and northeastern California. It has been characterized petrographically, by the major and minor element chemistry of its glass, and by its stratigraphic position with respect to other tephra layers. At a newly described locality on Squaw Creek, northwest of Gerlach, Nevada, at the north end of the Smoke Creek Desert, Trego Hot Springs tephra has been found in sediments of the Sehoo and Indian Lakes formations. The depositional environments of these sediments show that when the tephra fell, pluvial Lake Lahontan stood between 1256 and 1260 m, and that immediately thereafter the lake rose to at least 1275 m. These data corroborate earlier findings by Benson (Quaternary Research9, 300–318) from radiometric dating of calcareous tufa. However, the Lake Lahontan area has been affected by isostatic subsidence and rebound in response to changing water loads, so that caution is required in the use of lakeshore elevations in correlation.

Type
Original Articles
Information
Quaternary Research , Volume 19 , Issue 3 , May 1983 , pp. 312 - 324
Copyright
University of Washington

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