At one of our ranches in Texas we always find Indian artifacts. Found one of these back in the 70s and man I thought I found bigfoots spear.
My grandfather told me that it was a Native American harrowing tip, that it would be tied into a longer wooden handle and that it would be used much like a hoe to dig the earth.
Not sure if that was true, he was the sort of man who had an answer for everything, or at least at such a young age you would certainly think he was correct.
It's hard to tell from the pics, but I don't see any pressure flaking. A flint celt would most likely be pressure flaked and sometimes they were polished. I'm inclined to say it is a preform because of the lack of edge work.
I agree with everyone that says it looks like a flint celt, chisel, or hoe in form. The thing that puzzles me is what appears to be the strange patination, or cortex remains. It looks as if this item was made out of a natural stone that was pretty much this shape to begin with, and minimal flaking was needed to get it to it's current shape. It looks as though bits of the cortex remain all over the piece. Either that, or it is an artifact that was re-worked anciently, with the greyish areas being the newer re-working, and the darker brownish areas being the older surface. Anybody else see the patina as strange?
Probably some type of digging tool. Years ago someone tried to sell me a couple similar to yours that were from Missouri. Can't remember what he was calling them though.
Pretty neat piece It looks to be a water worn artifact to me. If it was found in the water and laid there for a few thousand years the water can actually erase the flaking on it and finally turn it back to its natural state of just being a rock if it was in the current or wave action.