 The lower end of a femur was found near it, and when he fitted them together, the angle of the knee joint clearly showed that this fossil, reference AL 129-1, was an upright walking hominin.This fossil was later dated at more than three million years old—much older than other hominin fossils known at the time.The site lay about from the site where "Lucy" subsequently was found, in a rock stratum deeper than that in which the Lucy fragments were found.