The Drainage of Lake Agassiz Left Its Signature in Stone Across the Landscape.

The outburst floods that drained Lake Agassiz were not simply events of extraordinary water volume. Randall points to something hiding in the place names of the landscape itself - Big Stone City, Big Stone Lake - locations where enormous rocks are scattered across the terrain with no obvious geological explanation for how they got there. The big stones were not deposited by gradual geological processes. They arrived in a catastrophic drainage event that carried far more than water.

Graham Hancock completes the mechanism with precision - the outburst floods were turbulent flows filled with icebergs the size of oil tankers. Inside those icebergs, locked within the ice, were massive chunks of rock that had been frozen in as the glaciers advanced. As the floods carried those icebergs across the landscape and they eventually melted, the rocks locked inside them were simply released - dropped wherever the iceberg happened to be when the ice gave way. The place names, the scattered boulders, and the turbulent flood record all point to the same event - a catastrophic drainage of Lake Agassiz that left its mark not just in the geology but in the very names that stuck to the landscape long after the water was gone.