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Radiocarbon Age Anomalies in Land Snail Shells from Texas: Ontogenetic, Individual, and Geographic Patterns of Variation

Published online by Cambridge University Press:  18 July 2016

Glenn A Goodfriend ,
G Lain Ellis  and
L J Toolin
Glenn A Goodfriend
Affiliation:
Department of Geology, George Washington University, Washington, DC 20052 USA
G Lain Ellis
Affiliation:
Environmental Affairs Division, Texas Department of Transportation, 125 E 11th St, Austin, TX 78701-2483 USA
L J Toolin
Affiliation:
NSF AMS Facility, University of Arizona, PO Box 210081, Tucson, AZ 85721 USA
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Abstract

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Accelerator mass spectrometric (AMS) radiocarbon analyses of live-collected, prebomb samples of shell carbonates of the land snails Rabdotus dealbatus and R. alternatus from Texas were carried out to quantify the characteristic age anomalies of land snails from limestone areas. Age anomalies are similar for the two species; they average +700 yr and vary by ±180 yr (1σ) among samples. Serial analysis of 1 shell reveals a significant ontogenetic trend in 14C age anomalies, with older apparent ages (up to 1200 yr) in the apical part of the shell and younger and uniform ages in the last whorl. No trend in age anomalies was found across a broad range of rainfall conditions (from 300 to 1000 mm mean annual rainfall).

Type
Articles
Information
Radiocarbon , Volume 41 , Issue 2 , 1999 , pp. 149 - 156
Copyright
Copyright © The American Journal of Science 

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