http://www.int.iol.co.za/index.php?set_ ... 205C997417
Thackeray said the tools, which have been flaked in several places to form a cutting edge, probably would have been used to break animal bones to get at the marrow.
The marrow is likely to have been an important source of protein to supplement a prehistoric diet of roots, tubers, fruit and insects, said Thackeray.