For the sake of argument, adopt the proposition implied by Wood (1997) that early species of Homo did not participate in the production of Oldowan stone tools. What other puzzles must we now solve? Note that after the invention of Oldowan tools, the next advance in tool making is marked in the archaeological record by the appearance of Acheulean tools, which are substantially more sophisticated than Oldowan tools (Johanson et al. 1996). Acheulean tools appeared about 1.4 million years ago and persisted until less than 200,000 years ago.
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