Sunset Crater, San Francisco Volcanic Field
Tuesday, November 20, 2018 - 08:40
in Astronomy & Space
The San Francisco Volcanic Field is a 4,700 square kilometers (1,800 square miles) area in the southern boundary of the Colorado Plateau. The field contains more than 600 scoria cones active in the past six million years. The Sunset Crater is the youngest of these scoria cones, and was active about 1000 years ago.