The Rate of Man's Evolution

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Scientific paper

ALL those interested in the important question of man's evolution will have read with pleasure Sir Arthur Keith's recent contribution to this problem in NATURE (August 29, 1925). It is with some diffidence, therefore, I record the fact that I am unable to agree with certain of his conclusions. He states in the article above mentioned (p. 317), that the Ice Age terminated ``some 12,000 years ago'', and again (p. 319), that the well-known paheolithic epoch-the Mousterian-``closed some 20,000 years B.C''. It is, however, known that the close of pahæolithic times coincided with that of the Ice Age, and thus, according to Sir Arthur Keith's dating, the distinct and widespread civilisations of the Aurignacian, Solutrean, and the Magdalenian, together with the change of climate and of fauna that accompanied them, can have occupied no more than 10,000 years.

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