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

18 reactions | Little preview of the Missoula leg of the Scablands tour, already scheduled for next year! ** https://contactatthecabin.com/montana/ ** [From #kosmographiapodcast Ep069] ** #randallcarlson #missoulamontana #camasprairie #iceage #floods #glaciallake #followtheevidence | The Randall Carlson | Facebook

One of the largest floods ever documented raced through north Idaho. It’s called the Missoula flood, and it occurred fairly recently, like 15,000 years ago. It’s one of the events we examine in “Idaho Geology, A Convergence of Wonders,” airing Sunday at 7 p.m. on Idaho Public Television. Here’s a taste of it. And you can read about it here on our website for the show. http://idahoptv.org/outdoors/shows/geology/ | Outdoor Idaho

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