Abstract
Geophysical data strongly indicate that stone assemblages, which include bifaces and cleavers, from East Africa, are at least a million years old. Since these artefacts seem to be much older than any of their known counterparts in Europe, the question of the date of man's expansion from the tropics into cool, temperate regions is raised for discussion.
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Isaacs, G., Curtis, G. Age of early Acheulian industries from the Peninj Group, Tanzania. Nature 249, 624–627 (1974). https://doi.org/10.1038/249624a0
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DOI: https://doi.org/10.1038/249624a0
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