Age model for a continuous, ca 250-ka Quaternary lacustrine record from Bear Lake, Utah-Idaho

Quaternary Science Reviews
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The Quaternary sediments sampled by continuous 120-m-long drill cores from Bear Lake (Utah-Idaho) comprise one of the longest lacustrine sequences recovered from an extant lake. The cores serve as a good case study for the construction of an age model for sequences that extend beyond the range of radiocarbon dating. From a variety of potential age indicators, we selected a combination of radiocarbon ages, one magnetic excursion (correlated to a standard sequence), and a single Uranium-series age to develop an initial data set. The reliability of the excursion and U-series data require consideration of their position with respect to sediments of inferred interglacial character, but not direct correlation with other paleoclimate records. Data omitted from the age model include amino acid age estimates, which have a large amount of scatter, and tephrochronology correlations, which have relatively large uncertainties.

Because the initial data set was restricted to the upper half of the BL00-1 core, we inferred additional ages by direct correlation to the independently dated paleoclimate record from Devils Hole. We developed an age model for the entire core using statistical methods that consider both the uncertainties of the original data and that of the curve-fitting process, with a combination of our initial data set and the climate correlations as control points. This age model represents our best estimate of the chronology of deposition in Bear Lake. Because the age model contains assumptions about the correlation of Bear Lake to other climate records, the model cannot be used to address some paleoclimate questions, such as phase relationships with other areas.

Publication type Article
Publication Subtype Journal Article
Title Age model for a continuous, ca 250-ka Quaternary lacustrine record from Bear Lake, Utah-Idaho
Series title Quaternary Science Reviews
DOI 10.1016/j.quascirev.2005.10.015
Volume 25
Issue 17-18
Year Published 2006
Language English
Publisher Elsevier
Contributing office(s) Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center
Description 12 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Quaternary Science Reviews
First page 2271
Last page 2282
Country United States
State Idaho, Utah
Other Geospatial Bear Lake
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