Indian Artifact Experts Needed

Cromagnons then?
No no no haha I mean I think it's just a rock with some natural flat surfaces on it, fracture lines or whatever they'd be called, a crystalline structure sort of like basalt (not saying this is basalt, it looks like granite or even more like straight feldspar to me. Granite is a mix of feldspars and quartzes and some other things I believe. But feldspar on its own does stuff like this.
 
This opposing side beveled piece is cool and first I've seen this on an artifact:
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there is a split in a river near here that formed a island the indians must have camped on for hundreds of years(maybe many different tribes) after the spring floods go down arrow heads and worked pieces are still found, when i was a kid there was a old man who had hundreds of arrow heads he collected for over 50 years in frames arranged in different desings.
 
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