Drought, Not Bison Scarcity, Drove Abandonment of Ancient Montana Hunting Site

A recent study published in *Frontiers in Conservation Science* has resolved a long-standing archaeological mystery regarding the Bergstrom site in central Montana. For approximately 700 years, Indigenous hunters utilized this location for bison harvesting, only to abruptly abandon it 1,100 years ago. Contrary to common assumptions that hunting sites were vacated due to the migration or depletion of prey, researchers found that bison remained abundant in the region long after the site fell into disuse.

By utilizing a multidisciplinary approach—combining archaeological excavations with sediment coring, radiocarbon dating, and climate reconstruction—the research team determined that environmental stressors were the primary catalyst for abandonment. Specifically, the data revealed that recurring, multi-decadal droughts significantly reduced water availability at a nearby creek. While the site remained ecologically viable for bison, it became impractical for the labor-intensive process of butchering and preserving large numbers of animals, which required a reliable local water source.

Beyond environmental factors, the study highlights a shift in the socio-economic landscape of the time. As hunting strategies evolved toward more coordinated, large-scale operations, groups required more dependable, resource-rich locations. The abandonment of the Bergstrom site serves as a prime example of how ancient populations adapted to climate volatility by reevaluating their logistical needs. This research underscores that human migration and land-use patterns in the Great Plains were driven not just by the presence of game, but by the complex interplay between environmental stability and the evolving organizational requirements of hunting societies.