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High-Precision Radiocarbon Dating of Bristlecone Pine from 6554 to 5350 BC

Published online by Cambridge University Press:  18 July 2016

Timothy W Linick
Affiliation:
Department of Geosciences, University of Arizona, Tucson, Arizona 85721
Austin Long
Affiliation:
Department of Geosciences, University of Arizona, Tucson, Arizona 85721
Paul E Damon
Affiliation:
Department of Geosciences, University of Arizona, Tucson, Arizona 85721
C Wesley Ferguson
Affiliation:
Department of Geosciences, University of Arizona, Tucson, Arizona 85721
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Abstract

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New results of radiocarbon dating of ca 100 decadal bristlecone pine samples from 6554 BC to 6084 BC and from 5820 to 5350 BC are presented. Using 3 new 2.5L counters filled to ca 3atm with carbon dioxide, high-precision dating has been performed by this laboratory for more than two years. Demonstration of the precision and accuracy of these counters is presented using ±2‰ measurements from the Spörer minimum period. For the older samples, ±3‰ measurements were made using ca 12-day counting times. Results are presented both as C age bp vs dendro-year BC, particularly for calibration purposes, and as Δ14C vs time.

Type
Research Article
Copyright
Copyright © The American Journal of Science 

References

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