Bingo. Like BC said, it's next to impossible to date stone points, at least using today's "technology". When something worked, someone else copied it. You can go to pretty much any of the larger traditional tournaments/gatherings/rendevous and find knappers that can generally tell you as much or more about a particular tribe or point than any geologist could, and then he/she will proceed to make one using the same tools--and it can't be discerned from an original.

My dad has a big collection of stone points. My brother and I want him to sell them, because it's getting harder and harder to authenticate them. My dad knows where most of these came out of the ground (he used to hunt them), but prove it? Good luck.

Btw, atlatls supposedly pre-date archery, but not by a whole lot. Large stone points were used--my best friend killed a whitetail not a month ago using a large stone point than an expert knapper made for him.