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

  • Douglas J Kennett (a1), Brendan J Culleton (a1), Barbara Voorhies (a2) and John R Southon (a3)

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.

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Copyright

Corresponding author

Corresponding author. Email: dkennett@uoregon.edu.

References

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

  • Douglas J Kennett (a1), Brendan J Culleton (a1), Barbara Voorhies (a2) and John R Southon (a3)

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