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Paleoliquefaction features at Arches NP

One of the most unusual features I mapped at Arches Park were these enormous paleoliquefaction structures, which looked like gigantic sand boils, petrified in time. 20 years later Walter Alvarez at U.C. Berkeley explained these as the result of a nearby meteorite impact during the Jurassic Period. I mapped similar features in upper Lake Powell, though more subdued.