I own a bison vertebra with a flint head in it. I bought it from a guy in Montana who picked it up at a jump. I've had it for over 30 years. I wrote a story about it many years ago for Traditional Bowhunter magazine if I'm not mistaken. I sent mine off to an archeological society in Ohio who studied it. I couldn't believe how much they told me about it. It came from the base of the neck of a young bison. It was buried in gravel, not dirt. The hunter either shot uphill at a very steep angle or the bison was lying on its side when hit, which I believe to be the correct answer since it was found at a jump. It had probably first been driven over the buffalo jump and hurt during the fall. They aged mine at 5,000 to 7,000 years old and suggested it was probably killed with an atlatl rather than a bow. This sort of stuff has always fascinated me, as like arrowheads, each piece has an untold story. At 73 years old, I have recently decided to sell a lot of my collectible artifacts in the very near future. I just sold a petrified shed whitetail antler that was aged at over 11,000 years minimum. Its stone, not bone and much like petrified wood. I actually have a collection of seven or eight more that will probably go on the auction block this fall.