I just spent a few days out in the Mojave desert near an old Native American quarry site, and ran across this hammerstone and associated flakes on the ground – the tool or weapon the guy was working on got carried away, but the evidence of it’s manufacture has remained as he left it for 500? 1000? years.
Also, a display of surface projectile point finds from a small area in Eastern Nevada…tracing the evolution of point technology for about 14,000 years
