Tools for sharpening blades (Bac Son traces), Schiste stone, Bac Son culture, c. 11,000 - 6,000 BP.
Tools for sharpening blades (Bac Son traces), Schiste stone, Bac Son culture, c. 11,000 - 6,000 BP.
The tools are long and slightly flat, and made from small pebbles. There are long sunken concaves on one or more surfaces to sharpen blades. In this period, the tool grinding techniques were already developed. These types of tools were popular in Bac Son culture and are called “Bac Son traces”.