So i found a piece of shail in the potomac river several hours upstream from dc, near the unincorporated town of Levels, WV. The rock resembled an axe head. I stuck it in my kayak and when i reached my destination i began to sharpen it against a brick. Well, i dont know why but after awhile i had fashioned a stone age tool or weapon of some kind. It is not sharp but could probably take down an animal or person. It might also be a useful food prep tool. Here it is.