How did the bison die? Still an open question
The part that keeps bringing researchers back is easy to ask and hard to answer. How did hundreds of bison end up dead in one place? Decades of work have not settled it, and the exhibits here are built to be updated as new evidence comes in. That is unusual for a federal site, where signs and waysides often stay fixed for years.
The first reading, in the years after 1968, was a kill site. The idea was that Paleoindian hunters drove a herd to its death, perhaps over a drop or into a trap. Stone tools and projectile points found among the bones supported people being present and active here.
Research in the 1990s pushed back on that. Some scientists argued the bison may have died from natural causes such as disease, drought, or fire, with people arriving later to use what was left. Many bones lack clear cut marks, and a surprising number of skeletons are close to complete. If hunters had butchered the herd for meat and hides, you would expect large parts of each animal to be missing.
Later digs found signs of people using the spot again and again over hundreds of years. Different point styles, including Cody and Eden points, show that more than one group passed through. The honest answer today is that the picture is mixed and the work is not finished. When you visit, you are looking at a question scientists are still arguing about, not a settled story.