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- W656293085 abstract "Archaeologists often turn to physical science for help in determining ages of sites and/or materials. Electron spin resonance (ESR) has proven a valuable tool for dating eutherian teeth from archaeological, paleoanthropological, and paleontological sites ranging in age from 10 ka to 5 Ma. Because tooth enamel is the body's hardest tissue, teeth are frequent components of fossil assemblages. The ESR signal stability in enamel exceeds 100 Ma. In eutherian teeth, the ESR signal does not depend on species. We have tested metatherian, reptilian and chondrichthyian teeth to see whether this method can be extended to additional environments and time periods. In diprotodontid marsupial teeth, the ESR signal appears identical to that in eutherian enamel. The crocodylian teeth tested here contained significant iron concentrations, which interfered with the ESR signal. Their fossilization in fluvial sediment may have caused the iron contamination. Reliability in other reptile teeth remains to be tested. Although shark teeth contain enameloid rather than enamel, the ESR signal morphology differs only slightly. However, the signal stability is reduced and calculated ages are much younger than expected." @default.
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- W656293085 date "2007-08-16" @default.
- W656293085 modified "2023-10-16" @default.
- W656293085 title "Archaeological Chemistry" @default.
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- W656293085 doi "https://doi.org/10.1021/bk-2007-0968" @default.
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