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A new tree-ring width, delta-C-13 and C-14 investigation of the two creeks site

Leavitt, S.W. and Kalin, R. (1992) A new tree-ring width, delta-C-13 and C-14 investigation of the two creeks site. Radiocarbon, 34 (3). pp. 792-797. ISSN 0033-8222

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Abstract

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 deltaC-13 scatter among trees typical of that found within modem sites, with some matches of isotopic maxima and minima. Some downward deltaC-13 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.

Item type: Article
ID code: 16303
Notes: 14TH INTERNATIONAL RADIOCARBON CONF ( 14C14 ), TUCSON, AZ, MAY 20-24, 1991
Keywords: radiocarbon, cellulose, wood, tree rings, Engineering (General). Civil engineering (General)
Subjects: Technology > Engineering (General). Civil engineering (General)
Department: Faculty of Engineering > Civil and Environmental Engineering
Related URLs:
    Depositing user: Prof Robert M Kalin
    Date Deposited: 17 Nov 2010 13:43
    Last modified: 12 Mar 2012 11:04
    URI: http://strathprints.strath.ac.uk/id/eprint/16303

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