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What significant archaeological discovery was made in Olduvai Gorge in northwestern Tanzania?

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In 1959 archaeologist and paleoanthropologist Mary Leakey was working at the famed Olduvai Gorge prehistoric site in northwestern Tanzania when she discovered a near-perfect skull originally classified as Zinjanthropus boisei but now regarded as Paranthropus boisei, a type of australopith, who inhabited the area between 2.3 and 1.2 million years ago.