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Hyaloclastite Dam was a 1,201-foot-high (366 m) lava dam that occupied the Grand Canyon of the U.S. state of Arizona. It formed during the Pleistocene epoch when basaltic lava flows from the Uinkaret volcanic field blocked the Colorado River. The dam failed catastrophically 160,000 years ago to prod
uce the largest-known outburst flood on the Colorado River in the Grand Canyon. A slump block of basalt is the remaining remnant of the Hyaloclastite Dam.
Listen to the audio guide for Hyaloclastite Dam Free on WIP — starts by itself when you arrive, even with the screen off