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Radiocarbon Ages and Environments of Deposition of the Wono and Trego Hot Springs Tephra Layers in the Pyramid Lake Subbasin, Nevada

Published online by Cambridge University Press:  20 January 2017

Larry V. Benson ,
Joseph P. Smoot ,
Michaele Kashgarian ,
Andrei Sarna-Wojcicki  and
James W. Burdett
Larry V. Benson
Affiliation:
U.S. Geological Survey, 3215 Marine Street, Boulder, Colorado, 80303-1066
Joseph P. Smoot
Affiliation:
U.S. Geological Survey, MS 955, Reston, Virginia, 22092
Michaele Kashgarian
Affiliation:
Lawrence Livermore National Laboratory, P.O. Box 808, L-397, Livermore, California, 94550
Andrei Sarna-Wojcicki
Affiliation:
U.S. Geological Survey, MS 975, 345 Middlefield Road, Menlo Park, California, 94025
James W. Burdett
Affiliation:
U.S. Geological Survey, MS 963, Denver Federal Center, Lakewood, Colorado, 80225
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Abstract

Uncalibrated radiocarbon data from core PLC92B taken from Wizards Cove in the Pyramid Lake subbasin indicate that the Trego Hot Springs and Wono tephra layers were deposited 23,200 ± 300 and 27,300 ± 30014C yr B.P. (uncorrected for reservoir effect). Sedimentological data from sites in the Pyramid Lake and Smoke Creek–Black Rock Desert subbasins indicate that the Trego Hot Springs tephra layer was deposited during a relatively dry period when Pyramid Lake was at or below its spill point (1177 m) to the Winnemucca Lake subbasin. The Wono tephra layer was deposited when lake depth was controlled by spill across Emerson Pass sill (1207 m) to the Smoke Creek–Black Rock Desert subbasin.18O data from core PLC92B also support the concept that the Trego Hot Springs tephra fell into a relatively shallow Pyramid Lake and that the Wono tephra fell into a deeper spilling lake.

Type
Original Articles
Information
Quaternary Research , Volume 47 , Issue 3 , May 1997 , pp. 251 - 260
Copyright
University of Washington

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