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

S. M. Colman, Darrell S Kaufman, J. Bright, C. Heil, J. W. King, W. E. Dean, J. G. Rosenbaum, R. M. Forester, J. L. Bischoff, M. Perkins, J. P. McGeehin

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)2271-2282
Number of pages12
JournalQuaternary Science Reviews
Volume25
Issue number17-18
DOIs
StatePublished - Sep 2006

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Ursidae
bear
lakes
lake
paleoclimate
uncertainty
climate
tephrochronology
radiocarbon dating
sediments
uranium
statistical method
interglacial
sediment
chronology
statistical analysis
amino acid
case studies
amino acids

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

Age model for a continuous, ca 250-ka Quaternary lacustrine record from Bear Lake, Utah-Idaho. / Colman, S. M.; Kaufman, Darrell S; Bright, J.; Heil, C.; King, J. W.; Dean, W. E.; Rosenbaum, J. G.; Forester, R. M.; Bischoff, J. L.; Perkins, M.; McGeehin, J. P.

In: Quaternary Science Reviews, Vol. 25, No. 17-18, 09.2006, p. 2271-2282.

Research output: Contribution to journalArticle

Colman, SM, Kaufman, DS, Bright, J, Heil, C, King, JW, Dean, WE, Rosenbaum, JG, Forester, RM, Bischoff, JL, Perkins, M & McGeehin, JP 2006, 'Age model for a continuous, ca 250-ka Quaternary lacustrine record from Bear Lake, Utah-Idaho', Quaternary Science Reviews, vol. 25, no. 17-18, pp. 2271-2282. https://doi.org/10.1016/j.quascirev.2005.10.015
Colman, S. M. ; Kaufman, Darrell S ; Bright, J. ; Heil, C. ; King, J. W. ; Dean, W. E. ; Rosenbaum, J. G. ; Forester, R. M. ; Bischoff, J. L. ; Perkins, M. ; McGeehin, J. P. / Age model for a continuous, ca 250-ka Quaternary lacustrine record from Bear Lake, Utah-Idaho. In: Quaternary Science Reviews. 2006 ; Vol. 25, No. 17-18. pp. 2271-2282.
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