The dates detailed below are a selection of C 14 dates obtained from February 1966 to December 1967 for geologic samples. The method is essentially the same as described previously in Radiocarbon, 1966, v. 8 p. 74-95. All samples were subjected to pretreatment, differing in individual cases, to remove contamination. On one of our three installations, modern transistorized equipment replaced the original electronics. All dates reported have been calculated on the assumed half-life of 5568 yr for C 14 , and of 1950 as the reference year.
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Delibrias et al. (1969) studied this question.
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