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The Lukeino Formation contains an important sedimentary and fossiliferous record of the late Miocene (6.09–5.68Ma), which has in particular yielded the fossil remains of the oldest East African bipedal hominid called Orrorin tugenensis. This fluvio-lacustrine sedimentary succession crops out in the Kenyan part of the East African Rift. It is mainly composed of clay to sandy clay deposits intercalated...
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