In conformance with the request of the editors, ages in this date list have been calculated with the Libby half life value of 5568 ± 30 yr, although the present best estimate of the half life value is 5730 ± 40 yr (Godwin, 1962). Additional support for the latter value as being closer to the “effective” value for dating has been obtained by the measurements of samples of known age.
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Robert Stuckenrath (1963) studied this question.
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