Cosmogenic nuclide dating of sahelanthropus tchadensis
More recent studies suggest that Orrorin was in fact a bipedal hominin, but not in the direct line to Homo (Richmond and Jungers 2008). kaddabafossils in the Middle Awash region of Ethiopia.
The paleoecological evidence associated with Orrorin fossils suggests that the area was a woodland populated with lakes and streams. The two species are differentiated primarily on the C/P3 complex (canine-premolar features), specifically, that Ar. The fossil collection is comprised of fragments of the mandible and teeth, forearm, clavicle, and fourth toe.
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.
It is also important to keep in mind that new discoveries are made each year that refine what we know about human evolution.
What this means is that what you learn this quarter could change somewhat next year as new data is made available.
Ape-like features include brain size, heavy brow ridge.
Overall, the postcranial fragments are more ape-like; however, the toe bone mentioned previously is similar to the toe bones of Australopithecus afarensis, a species that had all the hallmarks of habitual bipedalism. Over 40% of the skeleton was recovered, which allowed the team to fully reconstruct the skeleton. afarensis have been found (60 individuals at least from Hadar alone!
While this can make studying human evolution frustrating at times, the new discoveries help us gain a better understanding of just how our early ancestors evolved.
It is highly recommended that you begin your exploration of human evolution by watching the documentary, Becoming Human.
Other characteristics such brain and body size and what, if any, cultural behaviors are associated with the fossil remains are also scrutinized.
The various features associated with hominins developed at different rates, a situation referred to as mosaic evolution.