Erratic Boulders - Rafted in Icebergs by the Ice Age Floods

Erratic boulders are scattered throughout the Ice Age Floods region. Many of the boulders resting on the younger Columbia River Basalt flows were transported within icebergs from the Rocky Mountains. Floodwaters from Glacial Lake Missoula swept over eastern Washington and down the Columbia River Gorge at speeds in excess of 60 miles per hour. The icebergs that carried the erratics often drifted into side channels during flood events. The stranded boulders now look out of place, grounded high on canyon walls above the scablands. Visit http://hugefloods.com/ to learn more about the Ice Age Floods.

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