The January issue of Scientific America has a report on page 10. It is quoting a report published online November 7, 2012, by Nature, about stone arrowheads found in South Africa approximately 71,000 years old.
Kyle S. Brown of the University of Cape Town and his colleagues argue that the tiny points they found, which the ancient people at PP5-6 made by carefully heating and shaping stone, are a proxy for complex cognition and that the 11,000-year duration of the tradition indicates it was transmitted verbally from generation to generation.
The online report has snapshots of the arrowheads. http://www.nature.com/nature/journal/v4 ... 11660.html
