Cosmogenic nuclide dating of sahelanthropus tchadensis geeks guide dating pdf

Bourlès, Philippe Duringer, Marc Jolivet, Régis Braucher, Julien Carcaillet, Mathieu Schuster, Nicolas Arnaud, Patrick Monié, Fabrice Lihoreau, Andossa Likius, Hassan Taisso Mackaye, Patrick Vignaud and Michel Brunet Ages were determined at two hominid localities from the Chad Basin in the Djurab Desert (Northern Chad).In the Koro Toro fossiliferous area, KT 12 locality (16°00′N, 18°53′E) was the site of discovery of Australopithecus bahrelghazali (Abel) and in the Toros-Menalla fossiliferous area, TM 266 locality (16°15′N, 17°29′E) was the site of discovery of Sahelanthropus tchadensis (Toumaï).The bones were found far from most previous hominin fossil finds, which are from Eastern and Southern Africa. In particular, if Toumaï is a direct human ancestor, then its facial features bring into doubt the status of Australopithecus because its thickened brow ridges were reported to be similar to those of some later fossil hominids (notably Homo erectus), whereas this morphology differs from that observed in all australopithecines, most fossil hominids and extant humans.However, an Australopithecus bahrelghazali mandible was found in Chad by Beauvilain A., Brunet M. Another possibility is that Toumaï is related to both humans and chimpanzees, but is the ancestor of neither.

However, we can infer based on its environment and other early human species that it ate a mainly plant-based diet.The teeth, brow ridges, and facial structure differ markedly from those found in Homo sapiens.Cranial features show a flatter face, u-shaped dental arcade, small canines, an anterior foramen magnum, and heavy brow ridges. The fossil suffered a large amount of distortion during the time of fossilisation and discovery.This probably included leaves, fruit, seeds, roots, nuts, and insects.The first early humans, or hominins, diverged from apes sometime between 6 and 7 million years ago in Africa.

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