Dictionary of Human Evolution and Biology

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Time Scale

Estimation of the age of the several ages of the earth’s history. Prior to Buffon, the earth was considered to be less than 6,000 years old; by 1925, scientists reckoned that age to be 65 my (with the Age of Mammals and the Pleistocene then set at 3 mya and 500 kya, respectively); today, with the discovery of absolute dating techniques, each of these episodes had been expanded considerably.

See geological time scale.

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