Stratigraphic placement and age of modern humans from Kibish, Ethiopia

@article{Mcdougall2005StratigraphicPA,
  title={Stratigraphic placement and age of modern humans from Kibish, Ethiopia},
  author={Ian Mcdougall and Francis H. Brown and John G. Fleagle},
  journal={Nature},
  year={2005},
  volume={433},
  pages={733-736}
}
In 1967 the Kibish Formation in southern Ethiopia yielded hominid cranial remains identified as early anatomically modern humans, assigned to Homo sapiens . However, the provenance and age of the fossils have been much debated. Here we confirm that the Omo I and Omo II hominid fossils are from similar stratigraphic levels in Member I of the Kibish Formation, despite the view that Omo I is more modern in appearance than Omo II. 40Ar/39Ar ages on feldspar crystals from pumice clasts within a tuff… 
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