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Published online by Cambridge University Press: 03 June 2021
1 All Cro- numbers became GrN- numbers after correction for Suess effect, as indiclted in reference 112, Table 1; note a has therefore been omitted from all corrected dates in Column 4.
2 Sample numbers were not published in reference 96; italicized numbers in this column give the page number in the original Nature article, followed by number of sample or paragraph as printed there.