These were found recently in the back yard, one week and 50 yards apart. One is a scraper/chopper and the other an arrowhead. What really amazes me is the grooves knapped into the scraper. the part in shadow you see on the far left. My left thumb fits naturally into it, obviously for comfort and better control, and for left hand use. imagine the countless hours of experience it took to knock off two flakes and have it fit a thumb so perfectly...