Sunset Crater at Sunset
Sunset Crater is a cinder cone volcano that began erupting around 1064 AD. It's the most recently active member of the the 600 hills and mountains in the San Francisco volcanic field. Flagstaff, Arizona, USA lies on the southern edge of this 1,800 square mile (4,662 square kilometer) area that was active for 6 million years. Nearly every hill and mountain between Flagstaff and the Grand Canyon is one of these extinct volcanos.
It is certain that the predecessors of the Indians who built Wupatki Pueblo witnessed the eruptions of Sunset Crater.
Sunset Crater Volcano National Monument