Sunset Crater is the youngest cone in the San Francisco volcanic field in northern Arizona. Over the past 6 million years, more than 600 volcanic cones formed, with an eruption every 3,000 years on average. Sunset Crater may have erupted during the winter of the year 1064-1065. The erupted materials are alkali olivine basalts, which may have erupted over a 10 year period.
Figure: Digital Elevation Model from "Roadside Geology: Wuptaki anbd Sunset Crater Volcano National Monuments," by Sarah Hanson, AZGS Down-to-Earth series #15