Amino-acid racemizarion in Quaternary shell deposits at Willapa Bay, Washington

Details Amino-acid racemizarion in Quaternary shell deposits at Willapa Bay, Washington Amino-acid racemizarion in Quaternary shell deposits at Willapa Bay, Washington

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43.1505k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 43, Issue 9, pp.1505-1520

Physics

5

Scientific paper

Extents of racemization ( ratios) of amino acids in fossil Saxidomus giganteus (Deshayes) and Ostrea lurida Carpenter were measured on shell deposits exposed at 21 sites on the east side of Willapa Bay, Washington. Amino acids from Saxidomus show less variability in ratios and, therefore, are of greater use in correlation and age estimation than are amino acids from Ostrea . Shells of two different ages, about 120,000 ± 40,000 yr old and about 190,000 ± 40,000 yr old, are present. These ages correspond to Stages 5 and 7 of the marine isotope record defined by and in 1973 and hence the shell deposits likely formed during two different high stands of sea level. The stratigraphic record at Willapa Bay is consistent with this interpretation.

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