My cousin found a hunk of driftwood a few weeks ago that is oddly shaped. It appears to be a digging tool possibly used by native americans, though we are unsure. It was buried, which seems rather odd considering he was at Lake Michigan, though it is obviously possible that it was simply stuck in the sand.
As far as the texture, it is about a foot long and has a sharp curved edge at the bottom. There is a carved out area around the top that fits the thumb and allows the hand to grasp onto the tool for leverage to dig and for other purposes (if it is truly native american).