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Article Dans Une Revue Science Année : 2009

The Geological, Isotopic, Botanical, Invertebrate, and Lower Vertebrate Surroundings of Ardipithecus ramidus

Giday Woldegabriel
  • Fonction : Auteur
Stanley H. Ambrose
  • Fonction : Auteur
Raymonde Bonnefille
  • Fonction : Auteur
Laurent Bremond
Brian Currie
  • Fonction : Auteur
David Degusta
  • Fonction : Auteur
William K. Hart
  • Fonction : Auteur
Alison M. Murray
  • Fonction : Auteur
Paul R. Renne
  • Fonction : Auteur
M. C. Jolly-Saad
  • Fonction : Auteur
Kathlyn M. Stewart
  • Fonction : Auteur
Tim D. White
  • Fonction : Auteur

Résumé

Sediments containing Ardipithecus ramidus were deposited 4.4 million years ago on an alluvial floodplain in Ethiopia's western Afar rift. The Lower Aramis Member hominid-bearing unit, now exposed across a >9-kilometer structural arc, is sandwiched between two volcanic tuffs that have nearly identical (40)Ar/(39)Ar ages. Geological data presented here, along with floral, invertebrate, and vertebrate paleontological and taphonomic evidence associated with the hominids, suggest that they occupied a wooded biotope over the western three-fourths of the paleotransect. Phytoliths and oxygen and carbon stable isotopes of pedogenic carbonates provide evidence of humid cool woodlands with a grassy substrate.

Dates et versions

hal-00765388 , version 1 (14-12-2012)

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Citer

Giday Woldegabriel, Stanley H. Ambrose, Doris Barboni, Raymonde Bonnefille, Laurent Bremond, et al.. The Geological, Isotopic, Botanical, Invertebrate, and Lower Vertebrate Surroundings of Ardipithecus ramidus. Science, 2009, 326 (5949), pp.65, 65e1-65e5. ⟨10.1126/science.1175817⟩. ⟨hal-00765388⟩
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