I found these artifacts this summer searching the soybean field behind my cabin on Shelly Island in the Susquehanna. One is a worked edge, probably from a knife or scraper. The other I wasn't so sure about but I highly doubt it is natural. There is a near perfect 90 deg. channel in the middle of this small stone. My best guess is that it would have been used to sharpen bone fish hooks like a honing stone.