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Geological Setting and Age of Australopithecus sediba from Southern Africa.

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Title: Geological Setting and Age of Australopithecus sediba from Southern Africa.
Authors: Dirks, Paul H. G. M., Kibii, Job M., Kuhn, Brian F., Steininger, Christine, Churchill, Steven E., Kramers, Jan D., Pickering, Robyn, Farber, Daniel L., Mériaux, Anne-Sophie, Herries, Andy I. R., King, Geoffrey C. P., Berger, Lee R.
Source: Science (pre-March 2025). 4/9/2010, Vol. 328 Issue 5975, p205-208. 4p.
Subjects: Fossil hominids, Australopithecines, Archaeological geology, Geochronometry, Uranium-lead dating, Geological time scales, Geomorphology, Caves
Geographic Terms: South Africa
Abstract: We describe the geological, geochronological, geomorphological, and faunal context of the Malapa site and the fossils of Australopithecus sediba. The hominins occur with a macrofauna assemblage that existed in Africa between 2.36 and 1.50 million years ago (Ma). The fossils are encased in water-laid, clastic sediments that were deposited along the lower parts of what is now a deeply eroded cave system, immediately above a flowstone layer with a U-Pb date of 2.026 ± 0.021 Ma. The flowstone has a reversed paleomagnetic signature and the overlying hominin-bearing sediments are of normal polarity, indicating deposition during the 1.95- to 1.78-Ma Olduvai Subchron. The two hominin specimens were buried together in a single debris flow that lithified soon after deposition in a phreatic environment inaccessible to scavengers. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Geological Setting and Age of Australopithecus sediba from Southern Africa.
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 4/9/2010, Vol. 328 Issue 5975, p205-208. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Fossil+hominids%22">Fossil hominids</searchLink><br /><searchLink fieldCode="DE" term="%22Australopithecines%22">Australopithecines</searchLink><br /><searchLink fieldCode="DE" term="%22Archaeological+geology%22">Archaeological geology</searchLink><br /><searchLink fieldCode="DE" term="%22Geochronometry%22">Geochronometry</searchLink><br /><searchLink fieldCode="DE" term="%22Uranium-lead+dating%22">Uranium-lead dating</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+time+scales%22">Geological time scales</searchLink><br /><searchLink fieldCode="DE" term="%22Geomorphology%22">Geomorphology</searchLink><br /><searchLink fieldCode="DE" term="%22Caves%22">Caves</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22South+Africa%22">South Africa</searchLink>
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  Data: We describe the geological, geochronological, geomorphological, and faunal context of the Malapa site and the fossils of Australopithecus sediba. The hominins occur with a macrofauna assemblage that existed in Africa between 2.36 and 1.50 million years ago (Ma). The fossils are encased in water-laid, clastic sediments that were deposited along the lower parts of what is now a deeply eroded cave system, immediately above a flowstone layer with a U-Pb date of 2.026 ± 0.021 Ma. The flowstone has a reversed paleomagnetic signature and the overlying hominin-bearing sediments are of normal polarity, indicating deposition during the 1.95- to 1.78-Ma Olduvai Subchron. The two hominin specimens were buried together in a single debris flow that lithified soon after deposition in a phreatic environment inaccessible to scavengers. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        PageCount: 4
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      – SubjectFull: Fossil hominids
        Type: general
      – SubjectFull: Australopithecines
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      – SubjectFull: Archaeological geology
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      – SubjectFull: South Africa
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