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New exposures of Lava Creek ash more closely constrain the age of the Sacagawea Ridge glaciation, Wind River Mountains, Wyoming (USA)

Published online by Cambridge University Press:  22 May 2025

Dennis Dahms Open the ORCID record for Dennis Dahms [Opens in a new window] ,
Markus Egli ,
William C. McIntosh ,
Nels Iverson  and
Nelia W. Dunbar
Dennis Dahms*
Affiliation:
Department of Geography, University of Northern Iowa, Cedar Falls, IA, USA
Markus Egli
Affiliation:
Department of Geography, University of Zürich, Switzerland
William C. McIntosh
Affiliation:
New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, NM, USA
Nels Iverson
Affiliation:
New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, NM, USA
Nelia W. Dunbar
Affiliation:
New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, NM, USA
*
Corresponding author: Dennis Dahms; Email: dennis.dahms@uni.edu
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Abstract

Geochemical and 40Ar/39Ar age analyses of a new exposure of a previously destroyed volcanic ash locality within the Airport Terrace above the Middle Popo Agie River in Lander, Wyoming, allows us to re-establish it as Lava Creek A from the last major eruption of the Yellowstone caldera, with a weighted mean age of 628.2 ± 4.1 ka. Confirmation of the ash as Lava Creek more firmly establishes correlation of the terrace with the WR-7 terraces along the Wind River that contain Lava Creek ash and with outwash correlated to the Sacagawea Ridge type moraine at Dinwoody Lakes. By projecting the Airport Terrace gradient upstream, we show that it grades to the previously mapped terminus of the Sacagawea Ridge valley glacier. Additionally, 10Be boulder-exposure ages of ca. 521, ca. 554, and ca. 556 ka from Sacagawea Ridge moraines in nearby canyons support more closely constraining the Sacagawea Ridge glaciation here to Marine Oxygen Isotope Stage 16, which corresponds with recent evidence for an advance of the Laurentide Ice Sheet at this time in the U.S. midcontinent.

Keywords

U.S. Rocky MountainsWind River MountainsSacagawea Ridge glaciationMIS 16Lava Creek ashMid–Late Pleistocene Transition10Be exposure ages
Type
Research Article
Information
Quaternary Research , First View , pp. 1 - 25
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© The Author(s), 2025. Published by Cambridge University Press on behalf of Quaternary Research Center.

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