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Marine Episodes in Hudson Strait and Hudson Bay, Canada, during the Wisconsin Glaciation

Published online by Cambridge University Press:  20 January 2017

Charles A. Laymon
Charles A. Laymon*
Affiliation:
Department of Geological Sciences, and Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado 80309.
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Abstract

Twelve reworked shell fragments were recovered from five till samples collected on Nottingham Island in western Hudson Strait, Canada. Total hydrolysate amino acid ratios (D-alloisoleucine/L-isoleucine) for each fragment range from 0.043 to 0.154 and are significantly higher than ratios for radiocarbon-dated Holocene shells, which average 0.022. One shell fragment with an aIle/Ile ratio of 0.065 yielded an AMS radiocarbon age of 44,200 ± 2300 yr B.P. (AA-3254). Absolute age estimates based on the amino acid ratios are constrained by reasonable limits on the estimated effective diagenetic temperature of the fossils. On this basis, the shell fragments are correlated with oxygen isotope substages 5e and 5a and stage 3 in the preferred hypothesis. Theses results independently support hypotheses calling for at least partial deglaciation and marine incursion in Hudson Strait and Hudson Bay at these times.

Type
Research Article
Information
Quaternary Research , Volume 35 , Issue 1 , January 1991 , pp. 53 - 62
Copyright
University of Washington

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