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Olduvai Gorge, paleoanthropological site in the eastern Serengeti Plain, within the boundaries of the Ngorongoro Conservation Area in northern Tanzania. It is a steep-sided ravine consisting of two branches that have a combined length of about 30 miles (48 km) and are 295 feet (90 metres) deep. Deposits exposed in the sides of the gorge cover a time span from about 2.1 million to 15,000 years ago. The deposits have yielded the fossil remains of...