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

Authors

Larry Benson, University of Colorado at BoulderFollow
Joseph P. Smoot, U.S. Geological Survey
Michaele Kashgarian, Lawrence Livermore National Laboratory
Andrei Sarna-Wojcicki, U.S. Geological Survey
James W. Burdett, U.S. Geological Survey

Document Type

Article

Date of this Version

1997

Citation

Quaternary Research 47,251-260 (1997) ARTICLE NO. QR971897

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 21,300 ± 300 ¹⁴C 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.