Abstract

Age measurements on the Pre‐Cambrian rocks of this continent are continuing to appear at a slow rate, with finally a small amount of order becoming apparent. However, the seeming regula; ties may well be entirely the result of a desire to bring some order into the picture on the part of the writer rather than the regularities actually existing. It is with fear and trembling that any helium age is reported at this time, since there are still unresolved anomalies in the art of helium age measurement. Certainly all the values reported will be changed by at least a minor amount a better evaluations are made of gangue mineral contamination, and accuracy is increased by repeated measurements.

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