A person hits a dark shiny rock with another rock while a man voice describes something.
A person is rubbing two rocks together to shape and shine one.
A man is repeatedly rubbing two hard objects together while explaining what he's doing
A man is showing how to make a sharp knife out of volcanic glass
Someone holds a black object on their leg with one hand and uses a small rock to strike at it with the other hand.
A woman appears to smooth and sand a large stone as a male and a female voice are heard issuing commentary and instructions.
A woman rubs to rocks together as a man narrates.
a woman is shaving rock with a flint stone on top of a dog.
A person is rubbing an object several times and he keeps in a flat position
The man is flintknapping as he tries to make chipped stone tools.