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Ndutu cranium
The Ndutu skull is the partial cranium of a Middle Pleistocene hominin found at Lake Ndutu in northern Tanzania.
== Discovery ==
Lake Ndutu is a seasonal soda lake in the Serengeti, adjacent to Lake Masek and the Main Gorge at Olduvai. During September and October 1973, A. A. Mturi and the Tanzanian Department of Antiquities conducted an excavation of the exposed flats of the western shoreline of Lake Ndutu.〔 The excavation site was approximately 140 m2 in area and had considerable amounts of lithic and faunal material on the surface; the Ndutu cranium was found on the first occupational floor of the site.〔
Mturi’s excavation found 270 lithic and faunal materials in the first occupational floor of the excavation site, of which 20 were definitive tools.〔 The tools were mainly spheroids and hammerstones, with six flakes (three regular flakes, two triangular, one rectangular).〔 Mturi noticed the absence of Acheulean tools during his excavation, despite the cranial features of the skull being associated with the Acheulean industry.〔 However, hand axes were later discovered during later visits to the site.
According to Mturi, preliminary chronometric dating and racemization of bone found in the first occupational level has yielded a general age of 500,000 and 600,000 years.〔 Other estimates based on the association of the Ndutu deposits with the Masek Beds at Olduvai suggest an age approaching 400,000 years.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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