Cosmogenic nuclide dating of sahelanthropus tchadensis

Ape-like features include brain size, heavy brow ridge.Its human-like features include forward position of the foramen magnum (visit (scroll down) to view image comparing placement of foramen magnum in chimps, humans, and Sahelanthropus), reduced prognathism, smaller canine teeth, and intermediate thickness of the premolar and molar enamel.Paleoecological data suggest that this Sahelanthropus specimen died near a lakeshore and the area was extensively forested.Found in 2000 by a team led by Martin Pickford and Brigitte Senut, Orrorin tugenensis is represented by a collection of fossils that include a minimum of five individuals.Some tend to see broad ranges of variation, which results in fewer species.

Figure \(\Page Index\) - Sahelanthropus tchadensis The skull is a combination of ape-like and human-like features.In determining which species a fossil specimen belongs to, paleoanthropologists utilize comparative anatomy.There is much discussion among researchers as to the exact number of species.In determining what fossil features denote a specimen is a hominin, many different characteristics are examined, including those related to bipedalism, about which you previously learned, and non-honing chewing.Apes have a canine-premolar honing complex, which means that there is a diastema between the lower canine lower third premolar where the upper canine fits when the jaws close (Larsen 2014).

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