Summary A time-scale for the Tertiary period is suggested which is based on radiometric age-determinations published by March 1964. The principal boundaries are dated as follows: Comparison with time-scales published previously (Holmes 1959; Evernden et al. 1961; Kulp 1961) shows a number of differences in detail, but none of any magnitude. The date attributed to the Mio-Pliocene boundary is, however, rather younger than those given previously.
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B. M. Funnell (1964) studied this question.
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