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Modelling Age and Sedimentation Rates at the Page-Ladson Site

Author(s): David Carlson ; Angelina Perrotti ; Michael Waters ; Jessi Halligan

Year: 2017

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Summary

Stone tools and mastodon bones occur in an undisturbed geological context at the Page-Ladson site, Florida. Age models were created for excavation unit 50N/23E and core PLAD-AUC14-4A to estimate age ranges and sedimentation rates. The models were constructed using Bayesian models as implemented in OxCal to calibrate ages, combine equivalent age estimates, exclude outliers, and estimate deposition rates. The models were used to provide age estimates for artifacts recovered from the site, correlate deposition at the site with the Late Pleistocene transgression, and provide influx estimates for Sporormiella spores as proxy evidence for the presence of megafauna. Taken with other evidence, the analysis demonstrated that about 14,550 years ago people butchered or scavenged a mastodon next to a pond in a bedrock sinkhole within the Aucilla River. This occupation surface was buried by approximately 4 m of sediment during the late Pleistocene marine transgression, which also left the site submerged. Peak concentrations of Sporormiella occur around ~13,700 cal y B.P. may indicate peak megafaunal abundance in the vicinity of the sinkhole. A rapid decline in spore concentrations by ~12,600 cal y B.P. occurs after the onset of the Younger Dryas Stadial.


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Modelling Age and Sedimentation Rates at the Page-Ladson Site. David Carlson, Angelina Perrotti, Michael Waters, Jessi Halligan. Presented at The 81st Annual Meeting of the Society for American Archaeology, Vancouver, British Columbia. 2017 ( tDAR id: 430515)


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Spatial Coverage

min long: -91.274; min lat: 24.847 ; max long: -72.642; max lat: 36.386 ;

Record Identifiers

Abstract Id(s): 14419

Arizona State University The Andrew W. Mellon Foundation National Science Foundation National Endowment for the Humanities Society for American Archaeology Archaeological Institute of America