A skull, two cheekbones and three teeth of an humanlike species
living 6-7 million years ago, in Tchad 2500 km from Rift Valley has
been found. At that time the place was forest lake shore, close to
the savannah. Their teeth were humanlike and the spine hole in the
skull shows it was upright walking.
http://www.nature.com/nature/ancestor/
- Hans