Randall Carlson's theory suggests that the Columbia River Gorge in Washington state was carved by catastrophic floods caused by the collapse of an ice dam holding back Glacial Lake Missoula during the last Ice Age, around 12,000 to 15,000 years ago. He argues that during one of these catastrophic flood events, immense volumes of water were released from Glacial Lake Missoula. The floodwaters,-
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