Early tool use.
Posted: Thu Aug 12, 2010 4:34 am
Some of the cuts are V-shaped in cross section, for instance — a shape characteristic of those made by sharp tools — with scratches inside the cuts left by the tool's rough edge. Other marks showed signs of scraping, and still others indicated that the bones had been bashed with blunt rocks — perhaps in an effort to reach the marrow.
This implies that the users had the cognitive ability to recognize that a sharp stone performed differently than a big rock used as a hammer.