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What did the footprints Mary Leakey found in 1978 prove about the hominids of 3.6 million years ago?

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In 1978 she supervised excavations at Laetoli, Tanzania, where a set of footprints preserved in hardened volcanic ash were uncovered. These indicate a 3.6-million-year-old hominid—presumably Australopithecus) —walked upright.

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Similar questions: When did Mary Leakey supervise the excavations at Laetoli, Tanzania? Where did Mary Leakey find the set of hominid footprints? What evidence is there that Australopithecus walked upright? [ Hide these questions ]

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