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Any volcano in az. CVO Website - Arizona Volcanoes and Volcanics. USGS/Cascades Volcano Observatory, Vancouver, Washington Chiricahua National Monument Grand Canyon National Park Uinkaret Volcanic Field Vulcan's Forge Vulcan's Throne San Francisco Volcanic Field Sunset Crater, Sunset Crater National Monument Excerpts from: U.S.

CVO Website - Arizona Volcanoes and Volcanics

National Park Service Website - Geology Fieldnotes: Chiricahua National Monument, Arizona, April 2000 Twenty seven million years ago a volcanic eruption of immense proportions shook the land around Chiricahua National Monument. One thousand times greater than the 1980 eruption of Mount St. Eyjafjallajökull Volcano Photo, Iceland Wallpaper.