National Geographic : 2010 Jul
0mi 2 0km 2 Select hominid localities in the Middle Awash Ardipithecus Australopithecus Homo ARAMIS WALK DETAIL AT LEFT DETAIL AT LEFT BOURI WALK Ardipithecus ramidus "Ardi" 4.4 million years old Maka Bodo Amba East Asa Issie MIDDLE AWASH V A L L E Y BOURI PENINSULA CENTRAL AWASH COMPLEX Dulu Ali Herto Adgantole Borkana River JaraRiver Hatayae River Yardi Lake Aw ash River flow Saragata R. Dark gray basalts to the east of the Awash River can be used to date sediments lying beneath them. Sediment deposition continues today in lakes and rivers (blue) and floodplains and deltas (green). Bones buried quickly may become the fossils of the future. Faulting 250,000 years ago lifted up the Bouri Peninsula, forming a natural dam to the ancestral Awash River and creating Yardi Lake. The sediment in which Ardi was found is exposed along a five- and-a-half-mile arc that has yielded more than 6,000 vertebrate fossils, including at least 35 other Ar. ramidus individuals.