Abstract
The amino acid racemization dating technique is applied to the West Coast mollusc Chione from interglacial terrace deposits and Indian midden sites. The racemization kinetics of isoleucine were studied in Total hydrolysates and in the non-dialyzable Protein fraction from Chione shell. The reliability of the isoleucine dates was evaluated by (1) comparison with ages determined by radiocarbon and uranium disequilibrium dating, (2) species effects, and (3) reproducibility. Isoleucine dates for the interglacial terrace shell were found to be more reliable than the midden shell dates. A radiocarbon analysis of amino acids extracted from Del Mar midden shell was performed in order to resolve the discrepancies between the racemization ages and the 14 C dates on shell carbonate.
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