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A New Tree-Ring Width, δ13C and 14C Investigation of the Two Creeks Site

Published online by Cambridge University Press:  18 July 2016

Steven W. Leavitt  and
Robert M. Kalin
Steven W. Leavitt
Affiliation:
Laboratory of Tree-Ring Research
Robert M. Kalin
Affiliation:
Laboratory of Isotope Geochemistry, Department of Geosciences, The University of Arizona Tucson, Arizona 85721 USA
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Abstract

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We have made isotopic and dendrochronologic measurements on material collected from the Two Creeks site. Radiocarbon dating of outside wood of four logs yielded an average age of 11,760 ± 100 BP, in good agreement with results of Broecker and Farrand (1963) over 25 years ago. The range of 11,640 ± 160 to 11,900 ± 160 BP suggests a period of forest growth of 200–300 years, consistent with a ring-width chronology established by Kaiser (1987). Ring counting of five specimens gave a range of individual tree ages from 110 to 182 years, and width measurements indicate very low year-to-year variation in ring size. However, preliminary cross-dating of five samples produced a 202-year floating chronology. Stable-carbon isotope chronologies on cellulose from five-year ring groups show δ13C scatter among trees typical of that found within modern sites, with some matches of isotopic maxima and minima. Some downward δ13C trends may result from physiological response to rising lake levels (and/or cooling temperatures) at the site, which also produced very narrow rings in the outer ca. 50 ± 20 years.

Type
IV. Paleoclimatology
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 792 - 797
Copyright
Copyright © The American Journal of Science 

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