Winter of 2019 brought snow and cold to northern Arizona. San Francisco Mountain - a large composite volcano - and its peaks are mantled by snow. Rogers Lake lies 12 miles south-southwest of the mountain. Ted Grussing captured this aerial photo.
Download (free) John Bezy's "A Guide to the Geology of the Flagstaff Area" for descriptions and illustrations of some of the geologic features near Flagstaff. From John's introduction, " The Flagstaff area, on the southern margin of the Colorado Plateau, offers an exceptional variety of geologic wonders. The landscape of this plateau is composed of remarkable geologic features: the towering, glaciated peaks of San Francisco Mountain, underground lava tubes and blowholes; meteor-blasted Barringer Crater, and cinder cones and lava flows of the San Francisco volcanic field.
A Guide to the Geology of the Flagstaff Area: http://repository.azgs.az.gov/uri_gin/azgs/dlio/1540