Makapan

There was a cobble found at the Makapan site between 2.5 and 2.9 million years ago. It was picked up from where it had come to rest and was carried for at least 32 kilometers (or 4.8 km) into the Makapansgat Cave. The Makapan cobble was excavated from the Makapansgat Cave which contained australopithecine remains. Together with the remains of Australopithecus africanus and other species, the cobble was once again subjected to a sedimentation process. This saved both the cobble and bones in a fossil state.

The cobble was excavated from this deposit by W. I. Eitzman in 1925.  The cave is located in the Makapan Valley of the Northern Province, South Africa. The cobble bears several striking surface markings giving it the appearance of a head and face. In recent years, the view as to whether these markings may have been emphasized, or even manufactured by australopithecines has been argued. By far the most conspicuous aspect of this object are its eyes and the several other very prominent markings, all of which outline the appearance of a human face.  

Some researchers believe that the markings on the cobble are far too striking to have been overlooked by the australopithecines. And if they did not notice the markings, we would have to explain why they carried this object for such a great distance and then discarded it.  Scientists are not sure whether or not Australopithecus africanus made the design on the cobble or why it was carried 32 kilometers to the cave, probably a habitation site.  Anthropologist Robert G. Bednarik believes that the design was made entirely by natural processes and that Australopithecus africanus was most likely intrigued by its visual properties. 

Sources:

http://www.liv.ac.uk/sace/

http://www.d.umn.edu/cla/faculty/troufs/anth1602/video/Man_Hunters.html

By Steven Eskildsen