Abstract Since its initiation in 1966 the Omo Research Expedition has recovered a series of hominid fossils, in association with many vertebrate taxa, from formations of Pliocene/Pleistocene age from the lower Omo basin, southern Ethiopia. These fossiliferous formations span a time range from over 4.2 m.y. to about 1.4 m. y. on the basis of K/A age determination. Hominid remains have been found so far to occur at two localities in the upper part of the Usno Formation (∼ 2.9 m.y.) and in the Shungura Formation at 79 localities from successive Members B through levels postdating J, a time span between 3 m.y. and 1.4 m.y. The remains—inventoried here according to skeletal part, locality and stratigraphic level, age and situation—include numerous isolated and associated teeth, mandibles, partial maxillae, portions of crania, and elements of the postcranial skeleton.
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