64K views · 1K reactions | Hurricane Katrina was devastating—but the Lake Missoula floods were on another scale entirely. Modern floods? Measured in millions of cubic feet per second. Missoula? Try 350 million. That’s up to 10 surdrops—the same unit used to measure ocean currents. And it wasn’t minutes or hours… it surged for days. We’re just beginning to grasp the true power of these ancient megafloods. | The Randall Carlson | Facebook

When the Missoula floods surged into the Snake River, they backflooded 150 miles upstream, leaving fine silts at the distal reach. At the same time, the Bonneville flood thundered north through Hell’s Canyon, dropping massive boulders at its mouth. At Tammany Bar, the two torrents met —coarse Bonneville gravels overlying Missoula silts —a geological record of cataclysms colliding. | The Randall Carlson