Isochron dating methods

* Examines U-Pb dating of zircons, showing the highly contradictory dates usually obtained. Even if most isotopic dates are bad, some (or many) are “eminently reasonable”.

Olson - Emeritus Professor of Geology, Whitworth College, Spokane, Washington. Begging the Question: Where can we see the Law of Superposition employed to reject non-conforming dates, and then hear that isotopic-dating methods must be valid because they conform to their stratigraphic context? Even if all isotopic dates did show a local progression in conformity with the Law of Superposition, would one be therefore justified to leap to the conclusion that isotopic-dating methods are therefore validated? * Demonstrates how the highly touted Ar-Ar spectral method has not fulfilled its expectations. Is it fact, or uniformitarian wishful thinking, that there exists a tight consensus of dating results for the Phanerozoic geologic column? Gives examples of dates rejected in spite of producing a flat Ar-Ar release pattern.

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