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Orrorin lived about 6 million years ago, while Ardipithecus remains have been dated to 5.8-4.4 million years ago.
At present, the vote is still out as to whether any of these three primates were in fact true hominins and if they were our ancestors.
This view was mostly rejected by the scientific world of the time.
Before the 1920's, knowledge of our fossil ancestors only went back to the Neandertals in Europe and some presumably earlier human-like forms from Java, in Southeast Asia.
He based this on the fact that the natural range of our nearest living relatives, chimpanzees and gorillas, is limited to Africa.
He concluded that we ultimately must have shared a now extinct common ancestor with those apes in Africa.
He based this mainly on the shape and position of the base of the brain cast.
It indicated that the , or hole in the skull through which the spinal cord passes, pointed downward and was nearly at the central balance point of the skull.
However, long before then, Dart recognized the importance of this find.
In 1925 he named it (literally "southern ape from Africa").
The fossils have been tentatively classified as members of three distinct genera-- .
Sahelanthropus was the earliest, dating 7-6 million years ago.
Few researchers were willing to estimate the time period of the earliest hominins at much more than 100,000 years, and there was no inkling of anything older from Africa.Tags: Adult Dating, affair dating, sex dating