I occasionally find stone tools and arrowheads here in the Nevada outback. The style and sizes vary greatly. I try to take them to the University for the propeller heads to study. Some of them are not considered "normal" for this area. Probably indication migration of one tribe or another. Makes for interesting discussions. I mark each one with a tag and GPS coordinates. Crazy hobby cost me a 5x5 buck once though. Not watching.....
I grew up in the DC area and used to visit the Appalachian area frequently as a kid. Didn't have an interest in ancient tools then. Very nice country though.