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    Bayesian Analysis of High-Precision AMS 14C Dates from a Prehistoric Mexican Shellmound

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    Author
    Kennett, Douglas J.
    Culleton, Brendan J.
    Voorhies, Barbara
    Southon, John R.
    Issue Date
    2011-01-01
    
    Metadata
    Show full item record
    Citation
    Kennett, D. J., Culleton, B. J., Voorhies, B., & Southon, J. R. (2011). Bayesian analysis of high-precision AMS 14C dates from a prehistoric Mexican shellmound. Radiocarbon, 53(2), 245-259.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/654154
    DOI
    10.1017/S0033822200056526
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    We establish a precision accelerator mass spectrometry (AMS) radiocarbon chronology for the Archaic period Tlacuachero shellmound (Chiapas, Mexico) within a Bayesian statistical framework. Carbonized twig samples were sequentially selected from well-defined stratigraphic contexts based on iterative improvements to a probabilistic chronological model. Analytical error for these measurements is 15 to 20 14C yr. This greater precision and the absence of stratigraphic reversals eclipses previous 14C work at the site. Based on this, we establish a chronological framework for a sequence of 3 clay floors dating to between 4930 and 4270 cal BP and determine that the bedded shell deposits that formed the mound accumulated rapidly during 2 episodes: a lower 2-m section below the floors that accumulated over a 0-150 cal yr period at 5050-4875 cal BP and, an upper 3.5-m section above the floors that accumulated over a 0-80 cal yr period at 4380-4230 cal BP.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200056526
    Scopus Count
    Collections
    Radiocarbon, Volume 53, Number 2 (2011)

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