The age of Orrorin tugenensis, an early hominid from the Tugen Hills, Kenya

Yoshihiro Sawada · Martin H. L. Pickford · Brigitte Sénut · Tetsumaru Itaya · Masayuki Hyodo · Tamaki Miura +3 more

120 citations0/0 files storedComptes Rendus Palevol

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Pleistocene-Era Hominins and Archaeology Geological and Geochemical Analysis Geological and Geophysical Studies

Abstract

Throughout the history of the East African Rift valley, tectonic depressions and volcanic dams formed within the graben in which Middle Miocene to Recent volcanic rocks and lacustrine to fluvial sediments accumulated. During the Late Miocene, voluminous trachytes erupted in the vicinity of Kabarnet and almost filled the valley to its brim. Continued tectonic activity formed new basins floored by the Kabarnet Trachyte, one of which was located in the region immediately east of the present day Tugen Hills. The Lukeino sediments that accumulated in this basin crop out over an area of 44 km × 13 km. In 2000, Orrorin tugenensis, which is important for understanding the earliest stages of human evolution, was found in the Lukeino Formation 〚12〛, 〚13〛. It is concluded that the Lukeino formation accumulated between 6.0 and 5.7 Ma. Tout au long de l’histoire de la Rift Valley est-africaine, se sont formés des dépressions tectoniques et des barrages de coulées volcaniques à l’intérieur du graben dans lequel des roches volcaniques et des sédiments fluvio-lacustres se sont accumulés du Miocène moyen à l’Actuel. Au cours du Miocène supérieur, se sont produites dans la région de Kabarnet d’importantes éruptions de trachytes, qui comblèrent pratiquement la vallée. L’activité tectonique continue engendra la formation de nouveaux bassins, dont le plancher était constitué des trachytes de Kabarnet. Un de ces bassins était situé juste à l’est des collines Tugen actuelles. Les sédiments de Lukeino qui s’y sont déposés affleurent dans une zone de 44 km de long sur 13 km de large. En 2000, était découvert dans cette formation l’hominidé Orrorin tugenensis, important pour comprendre les premiers stades de l’évolution humaine 〚12〛, 〚13〛. Les résultats montrent que la formation de Lukeino s'est accumulée entre 6,0 et 5,7 Ma.

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References

2002A new hominid from the Upper Miocene of Chad, Central Africa 1994Australopithecus ramidus, a new species of early hominid from Aramis, Ethiopia 2001First hominid from the Miocene (Lukeino Formation, Kenya)2001Late Miocene hominids from the Middle Awash, Ethiopia 2001The geological and faunal context of Late Miocene hominid remains from Lukeino, Kenya 2002Stratigraphy, age and environments of the late Miocene Mpesida Beds, Tugen Hills, Kenya

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