The Bison Were Still Here—So Why Did the Hunt Stop?
In central Montana, a place called the Bergstrom site saw intermittent use by ancient hunters for approximately 700 years. It was a proven location for processing bison. But around 1,100 years ago, archaeologically visible use of the site ended.
The obvious assumption in archaeology is often that the animals moved on, and the hunters followed. However, sediment cores taken right beside the creek reveal a different story.
When researchers tested for prey collapse, vegetation changes, and fire frequency, the local ecological proxies showed no big local ecological collapse at abandonment. Pollen, charcoal, and herbivore indicators remained broadly stable after the site was abandoned.
The bison didn't disappear. So why did the site go quiet?
The Water Constraint
To understand the abandonment, we have to look at the mechanics of processing a massive animal. Butchering, cleaning, cooking, and preserving bison requires a significant amount of water.
According to the research, severe, recurring droughts likely reduced reliable processing water at the nearby Red Bluff Creek, making the site less workable. A site full of bones is useless if the water fails.
A Shift in Hunting Strategy
This localized drought coincided with a broader cultural and logistical shift on the Plains.
There was a broader shift toward larger, more coordinated communal hunting systems, which increased dependence on dependable water and infrastructure-friendly locations. Larger coordinated hunts need dependable water, fuel, and specific landscape features like jumps or containment areas.
When environmental conditions tighten, human effort naturally concentrates at the best sites that meet all requirements, pushing effort away from smaller or hydrologically marginal sites like Bergstrom.
The abandonment of the Bergstrom site isn't a story of collapse; it’s a story of reorganization. It serves as a reminder that human systems can stay stable overall, even while specific places go quiet.
Further Reading & Sources
- Primary Research: Frontiers in Conservation Science (DOI: 10.3389/fcosc.2025.1688950)
- Frontiers News Release: Bison hunters abandoned site 1,100 years ago
Visual Credits
- Bison bones scattered across the site. Credit: John Wendt
- Excavation area at the Bergstrom Site. Credit: Michael Neeley
- Students conducting archaeological excavations. Credit: Michael Neeley
- Sediment cores collected directly next to the excavation area. Credit: John Wendt
- Bison in Lamar Valley. Credit: Yellowstone National Park via flickr