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Ambitious-Event-5911 t1_jbdmx3v wrote on March 8, 2023 at 7:50 AM

Reply to comment by Beatnikdan in Explore North America 20,000 years ago, at the peak of the last glacial age [OC] by mydriase

This. And it extended farther South almost to Spokane. An ice dam formed where the Clark Fork empties into Lake Pend Orellie, forming glacial Lake Missoula, and leading to epic flossing during the thaw.