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Chronometric Dating in Archaeology pp Cite as. During the latter half of this century anthropological surveys in East Africa have made significant contributions to understanding how the human species has evolved. In the past two decades, particularly, discoveries of our fossil ancestors have been made in unprecedented numbers and diversity.

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The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes.

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