It's not uncommon, when exploring an area where Native Americans once lived, to come across arrowheads or spear points. Arrowheads were critical in the tribes' ability to get food.
Mankind has been using sharp spears to hunt meat since the days that he walked on two feet. Since wood splinters easily, the hunters soon learned to put a more sturdy stone tip on the end of their spear. They would shape this tip into a point, so it went easily into the animal. It would be tied onto the end of the spear with twine or rope.
Every group makes their spear and arrowheads in a particular style, so that archeologists can determine what group of people occupied an area by the arrowheads found there. The oldest spearheads found in the US date back to 11,000 years ago. Bows and arrows were developed about 0BC and because a given indian would carry far more arrows than spears, the number of arrowheads found is far greater than the number of spear points.
These arrowheads could be flaked from stone, often obsidian or slate because they flaked well, or carved from bone or ivory. Men were the hunters who handled the spears and arrows while the women did the gathering of berries. It was therefore usually the men who shaped the arrowheads and spear points.
Native American Information