Journal
QUATERNARY RESEARCH
Volume 82, Issue 3, Pages 490-503Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1016/j.yqres.2014.03.004
Keywords
Luminescence dating; Radiocarbon dating; Surface exposure dating; U-series dating; Ziegler Reservoir
Funding
- Division Of Earth Sciences
- Directorate For Geosciences [1153689] Funding Source: National Science Foundation
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The Ziegler Reservoir fossil site near Snowmass Village, Colorado (USA), provides a unique opportunity to reconstruct high-altitude paleoenvironmental conditions in the Rocky Mountains during the Last Interglacial Period. We used four different techniques to establish a chronological framework for the site. Radiocarbon dating of lake organics, bone collagen, and shell carbonate, and in situ cosmogenic Be-10 and Al-26 ages on a boulder on the crest of a moraine that impounded the lake suggest that the ages of the sediments that hosted the fossils are between similar to 140 lea and >45 ka. Uranium-series ages of vertebrate remains generally fall within these bounds, but extremely low uranium concentrations and evidence of open-system behavior limit their utility. Optically stimulated luminescence (OSL) ages (n = 18) obtained from fine-grained quartz maintain stratigraphic order, were replicable, and provide reliable ages for the lake sediments. Analysis of the equivalent dose (D-E) dispersion of the OSL samples showed that the sediments were fully bleached prior to deposition and low scatter suggests that eolian processes were likely the dominant transport mechanism for fine-grained sediments into the lake. The resulting ages show that the fossil-bearing sediments span the latest part of Marine Oxygen Isotope Stage (MIS) 6, all of MIS 5 and MIS 4, and the earliest part of MIS 3. Published by Elsevier Inc. on behalf of University of Washington.
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