Dictionary of Human Evolution and Biology

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Turnover-pulse Hypothesis

Proposal that a dramatic cooling event occurred between 2.8 and 2.4 mya that precipitated minor glaciation in the northern hemisphere, and simultaneously reduced the area of moist woodlands in Africa, replacing it with drier and more open savannas about 2.5 mya. This event seems to be correlated with an episode of rapid evolution in plants, hominoids, antelopes, rodents, and certain marine invertebrates. Among the new species of hominoids were several in the genera Australopithecus and Homo.

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