Geologists: supervolcanoes can bury huge expanses, but only in slow-motion

An article on Vice’s Motherboard reports on research by Greg Valentine, professor of geology, that tried to quantify the speed at which hot volcanic debris and ash traveled following the explosion of a supervolcano, based on the massive volcanic deposit that erupted from the Silver Creek Caldera in Arizona 18.8 million years ago.

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http://motherboard.vice.com/read/how-do-supervolcanoes-bury-such-huge-expanses-of-land-in-lava-very-slowly