Australopithecus sediba at 1.977 Ma and Implications for the Origins of the Genus Homo
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American Association for the Advancement of Science
Newly exposed cave sediments at the Malapa site include a flowstone layer capping the sedimentary unit containing the Australopithecus sediba fossils. Uranium-lead dating of the flowstone, combined with paleomagnetic and stratigraphic analysis of the flowstone and underlying sediments, provides a tightly constrained date of 1.977 ± 0.002 million years ago (Ma) for these fossils. This refined dating suggests that Au. sediba from Malapa predates the earliest uncontested evidence for Homo in Africa.
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Pickering, Robyn; Dirks, Paul H.G.M.; Jinnah, Zubair; De Ruiter, Darryl J.; and Churchill, Steven E. et al, "Australopithecus sediba at 1.977 Ma and Implications for the Origins of the Genus Homo" (2011). KIP Articles. 454.