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Cosmogenic (super 36) Cl and (super 10) Be ages of Quaternary glacial and fluvial deposits of the Wind River Range, Wyoming

Fred M. Phillips, Marek G. Zreda, John C. Gosse, Jeffrey Klein, Edward B. Evenson, Robert D. Hall, Oliver A. Chadwick and Pankaj Sharma
Cosmogenic (super 36) Cl and (super 10) Be ages of Quaternary glacial and fluvial deposits of the Wind River Range, Wyoming
Geological Society of America Bulletin (November 1997) 109 (11): 1453-1463


We measured cosmogenic (super 36) Cl in 56 samples from boulders on moraines and fluvial terraces in the vicinity of the Wind River Range, Wyoming. We also measured (super 10) Be in 10 of the same samples. Most of the (super 10) Be ages were in good agreement with the (super 36) Cl ages, indicating that rock-surface erosion rates were very low. The oldest moraine investigated, the type Sacagawea Ridge site, yielded only a limiting minimum age of >232 ka. The oldest moraines in the type Bull Lake complex also could be constrained only to >130 ka. The main sequence of type Bull Lake moraines yielded age distributions indicating deposition within the intervals 130 to 100 ka and 120 to 100 ka; the best estimates are closer to the upper limits of these ranges, and associated uncertainties are in the range of 10% to 15%. These uncertainties could permit deposition in either marine isotope stage 6 or stage 5d. We found no evidence of glacial deposits dating to marine isotope stage 4. Both Bull Lake-age moraines from Fremont Lake, on the opposite side of the Wind River Range, and boulders on a fluvial terrace above the Wind River, gave age distributions very similar to that of the second oldest Bull Lake advance (ca. 130 to 100 ka). The distribution of boulder ages for Pinedale moraines at Bull Lake indicated deposition between 23 and 16 ka, nearly identical to the distribution of (super 10) Be ages previously reported for the type Pinedale moraines at Fremont Lake.

ISSN: 0016-7606
EISSN: 1943-2674
Serial Title: Geological Society of America Bulletin
Serial Volume: 109
Serial Issue: 11
Title: Cosmogenic (super 36) Cl and (super 10) Be ages of Quaternary glacial and fluvial deposits of the Wind River Range, Wyoming
Affiliation: New Mexico Institute of Mining and Technology, Department of Earth and Environmental Science, Socorro, NM, United States
Pages: 1453-1463
Published: 199711
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1997-072381
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N42°45'00" - N43°30'00", W109°30'00" - W108°30'00"
Secondary Affiliation: Lehigh University, Bethlehem, PA, USA, United StatesUniversity of Pennsylvania, Philadelphia, PA, USA, United StatesIndiana University, Indianapolis, IN, USA, United StatesUniversity of California at Santa Barbara, Santa Barbara, CA, USA, United StatesPurdue University, West Lafayette, IN, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199724
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