The paper by Lee and Brookins (1978) is a very interesting study aimed at an exceedingly difficult and important problem. However, I would like to raise some questions of interpretation and apparent errors in processing of the isotope data that affect their conclusion.
First, Lee and Brookins (p. 1673) appropriately note, “If points exhibit wide scatter about the isochron, either open-system conditions have existed after mineral (or rock) formation or detrital minerals with different prehistories … account for the scatter.” By most standards, much of the data of Lee and Brookins (1978) exhibit just such wide scatter. Certainly all of...
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