ABSTRACT
Bed I deposits at Olduvai Gorge that accumulated onthe southeastern margin of paleo-Lake Olduvai yielded the first discoveries of H. habilis Leakey, Tobias, and Napier and Paranthropus (Zinjanthropus) boisei (Leakey) Robinson, along with a stone tool industry that became known as the Oldowan (1-5). Two additional late Pliocene hominid species known from East Turkana, Kenya [for example, (6)], the enigmatic H. rudolfensis (Alexeev) Groves and the H. erectus-like H. ergaster Groves and Mazak, have not been reported from Olduvai Gorge. In 1995, we recovered a hominid, designated OH 65, consisting of a maxilla with complete dentition and lower face. It was found in fluvial deposits from the western portion of the Bed I Olduvai lake basin (Figure 1) along with Oldowan stone artifacts and vertebrate fossils, some of which show evidence of butchery. The deposits were initially thought to be lower-most Bed II in age (1), but subsequent dating and stratigraphic analyses have shown them to be upper Bed I.
