Radioactive Dating of Tertiary Plant-Bearing Deposits

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Science  07 Apr 1961:
Vol. 133, Issue 3458, pp. 1079-1080
DOI: 10.1126/science.133.3458.1079


Four potassium-argon determinations from Tertiary rocks in the interior of British Columbia have yielded dates ranging from 45 to 49 million years. This suggests contemporaneity of three separate localities within the Middle Eocene epoch. Abundant plant micro- and macrofossils support this conclusion and indicate a flora quite different from floras of comparable age in western United States.