The Potassium-Argon Dating of Late Cenozoic Rocks in East Africa and Italy [and Comments and Reply]

  title={The Potassium-Argon Dating of Late Cenozoic Rocks in East Africa and Italy [and Comments and Reply]},
  author={Jack F. Evernden and Garniss H. Curtis and William Bishop and Charles Loring Brace and J. Desmond Clark and Paul E. Damon and Richard LeRoy Hay and David Moody Hopkins and Francis Clark Howell and Adolph Knopf and Mikl{\'o}s Kretzoi and Louis S. B. Leakey and Henry Evans Maude and JOYCE R. Richards and Donald Elvin Savage and Herbert Edgar Wright},
  journal={Current Anthropology},
  pages={342 - 385}
A technique for the potassium-argon dating of high potassium feldspars of less than 50,000 years age is described. The technique is applied to the obtaining of high precision ages in the time-range 60,000-2,000,000 years. Sufficient data are presented to show that the time-scale of Plio-Pleistocene glaciations is greater than 10 years and that the time-scale of hominoids capable of fashioning tools by the working of stone is at least 1.75 10 years. Several other points on the time-scale of… 

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