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A rock or layer may be dated by two or more radiometric methods. Sometimes the dates match impressively. Some dates don't match. Others match, but not at a "geologically acceptable" date. K/Ar and Rb/Sr ages, for example, may match, but not always at an "acceptable" date. Matching dates do not necessarily correspond with real time.


Ó 2010 Arthur V. Chadwick, Ph.D.