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The Road to Jaramillo

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Abstract

William Glen has written a highly detailed account of the overall development of the time scale for geomagnetic reversals based upon the potassium-argon dating of young volcanic rocks. His treatment begins with an account of the methods developed at Berkeley during the 1950s by John Reynolds, Garniss Curtis, and Jack Evernden for dating geologically young rocks. Then he details the use of these methods by Allan Cox, Richard Doell, and Brent Dalrymple at the U.S. Geological Survey in Menlo Park, Calif., and Ian McDougall and Don H. Tarling at the Australian National University (ANU) in Canberra to date magnetic rocks. And finally he covers the use of the resultant time scale in the confirmation of the Vine-Matthews-Morley hypothesis.

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