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Age Discrepancies with the Radiocarbon Dating of Sagebrush (Artemisia Tridentata Nutt.)

Published online by Cambridge University Press:  18 July 2016

Phil R Geib
Phil R Geib*
Affiliation:
Department of Anthropology, University of New Mexico, MSC01-1040, 1 University of New Mexico, Albuquerque, New Mexico 87131-0001, USA. Email: pgeib@unm.edu
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Abstract

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When ancient hearths at open archaeological sites do not yield carbonized annual plant remains or other high-quality samples, wood charcoal is commonly used for radiocarbon dating. Sagebrush (Artemisia tridentata Nutt.), a shrub frequently used for fuel across much of the western United States, seems a potentially better candidate for 14C dating than tree wood since the possibility for significant age discrepancy might be less. A comparison of multiple assays from single features reveals that sagebrush can overestimate age more than even tree wood charcoal. A plausible cause of this appears to be persistence of the shrub on the ground surface for an extended interval after death, such that use as fuel almost invariably occurs hundreds of years after fixation of carbon. The potential for age discrepancy may decrease as population density increases because the demand for fuel wood would have resulted in a more rapid turnover of the fuel biomass. This is not true for Archaic period foragers of western North America when population levels were likely quite low and residential mobility quite high.

Type
Articles
Information
Radiocarbon , Volume 50 , Issue 3 , 2008 , pp. 347 - 357
Copyright
Copyright © 2008 by the Arizona Board of Regents on behalf of the University of Arizona 

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