Stone projectile points found during the Fort Union excavations range in age from 7,800 BP to 200 BP. These points could have been used to hunt bison and other animals or for warfare against enemy tribes. The broken tips illustrate the fragility of stone points. NPS photo, left to right from top: In addition to the oxbow, besant, and plains side-notched points on the right side are a Knife River flint corner-notched Pelican Lake (middle, FOUS 3911), Porcelanti side-notched (left, FOUS 71265), and plains side-notched (middle, FOUS 99187) point.