Amino acid studies of the Del Mar, California, midden site: Apparent rate constants, ground temperature models, and chronological implications

Details Amino acid studies of the Del Mar, California, midden site: Apparent rate constants, ground temperature models, and chronological implications Amino acid studies of the Del Mar, California, midden site: Apparent rate constants, ground temperature models, and chronological implications

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..37..184w&link_type=abstract

Earth and Planetary Science Letters, Volume 37, Issue 2, p. 184-196.

Mathematics

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6

Scientific paper

Amino acid enantiomeric ratios in shell samples from the Del Mar, California, midden are interpreted in terms of apparent rate constants (derived from observed radiocarbon ages), exponentially decreasing ground temperatures (to values equal to those of mean annual air temperature at depths of approximately 1 m), and sample burial histories involving exposure to high ground temperatures during periods of shallow burial. These models, while approximate, are important in establishing the utility of shell material in amino acid racemization studies. The radiocarbon chronology (~4000 to ~9000 years) of the Del Mar shell samples (shell carbonate analysis) is stratigraphically consistent and quite reasonable within the uncertainties of these interpretive models. One level (the lowest) in the Del Mar site has yielded samples whose enantiomeric ratios indicate great antiquity. It is possible that these samples have a geological rather than archaeological origin.

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