Cannonman17 said:I hate to be the one to tell you this but it's not an artifact, it's just a rock. Rocks often times have veins of harder or softer material running through them so they errode/weather at different rates. The raised ridge on this piece is the result of a vein of harder material. Ground stone tools had valleys pecked into them, not sharply raised ridges. Also, ground stone tools were made much nicer, a ground stone tool doesn't become that rounded through use, it becomes polished.![]()