The year 2004 ends with a major story in archaeology, revealed by the use of new DNA technology on ancient bison bones scattered around western North America. The findings profoundly affect our understanding of how North America was populated by humans, and could have an impact on aboriginal politics as well. The conventional wisdom, taught to generations in school, speaks of a land bridge connecting Asia with Alaska. This now-submerged bridge was created by lower sea levels in the last ice age, which ended about 8,500 years ago. It was postulated that prehistoric tribes followed herds of migrating big animals down through an ice-free corridor roughly along the Rocky Mountains, eventually reaching all points of the continent and establishing what are now revered as the First Nations.It is now becoming clear that this conventional wisdom is wrong, or at least woefully incomplete.Lionel Jackson of the Geological Survey of Canada and Mike Wilson of Douglas College gave a talk on the latest findings Dec. 7 at the H.R. MacMillan Space Centre in Vancouver. Their work relates to DNA findings from an Oxford University team that focused on bison, the most widespread and persistent large animals of the era.

Two big points come out of the Oxford study: Bison were in decline, for reasons not yet clear, as much as 10,000 years before ice and human hunters put pressure on them, and the ice-free corridor was closed at least during the peak of the ice age. Isolated from the rest of the continent by glaciers, the northern bison died out. All of today's bison are descendants of a small southern group that eventually spread back up north.

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