Age of an Indonesian Fossil Tooth Determined by Electron Paramagnetic Resonance.

Bogard, J. S. ; Murray, M. E. ; Weeks, R. A. ; Weinand, D. C. ; Elam, J. M. ; Kramer, A.

Technical Information Center Oak Ridge Tennessee

关键词: Teeth;    Age;    Electron paramagnetic resonance;    Fossils;    Heating;   

RP-ID  :  DE2005838101

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The first fossil hominid tooth recovered during 1999 excavations from the Cisanca River region in West Java, Indonesia, was associated with a series of bovid teeth from a single individual that was recovered 190 cm beneath the hominid tooth. The age of the fossil bovid teeth was determined using electron paramagnetic resonance (EPR) analysis as part of an effort to bracket the age of the hominid tooth. The EPR-derived age of the bovid teeth is (5.16 (+-) 2.01) x 10(sup 5) years. However, the age estimate reported here is likely an underestimate of the actual age of deposition since evidence of heating was detected in the EPR spectra of the bovid teeth, and the heating may have caused a decrease in the intensity of EPR components on which the age calculation is based.