The tall aspen and pine trees are just breathtaking! By Bill Wade – a geologist and a 12-year member of Flagstaff’s USFS/NPS Interpretive Partnership. Northern Arizona is best known for the Grand Canyon. San Francisco Peaks Geology. Despite the extinct volcanoes, Arizona is actually home to a prominent volcanic field that is still active! Pictured above at center is a cinder cone volcano in the San Francisco Peaks Volcano Field near Flagstaff, Arizona.The peak in the background is Humphrey’s Peak (12,637 ft or 3,852 m), an extinct stratovolcano and the highest point in Arizona. The area presents some of Arizona's most impressive landscapes and geology. Of course there is … The San Francisco Peaks range, also called San Francisco Mountain, was once a huge, cone-shaped stratovolcano that rose somewhere between 16,000 and 20,000 feet high and looked like Mount Rainier in Washington or Mount Fuji in Japan. The vast San Francisco Volcanic Field in northern Arizona has more than 550 vents, the youngest of which is Sunset Crater, named for its brilliantly colored scoria deposits mantling the cone. Yup, the San Francisco Peaks are an extinct stratovolcano which last erupted some 200,000 years ago. The San Francisco Peaks (Spanish: Sierra de San Francisco, Navajo: Dookʼoʼoosłííd) are a volcanic mountain range in San Francisco volcanic field in north central Arizona, just north of Flagstaff and a remnant of the former San Francisco Mountain.The highest summit in the range, Humphreys Peak, is the highest point in the state of Arizona at 12,633 feet (3,851 m) in elevation. Eruptions built the peak between 1 million and 400,000 years ago. The San Francisco Peaks, which dominate the Flagstaff skyline, are the remnants of a giant stratovolcano. The San Francisco volcanic field is a vast area covering more than 10,000 km22 containing cinder cones, lava fields, lava domes and the majestic (extinct) San Francisco Peaks, the highest of all mountains in Arizona, rising 5,000 feet above the surrounding plateau. The San Francisco volcanic field is a vast area covering more than 10,000 km22 containing cinder cones, lava fields, lava domes and the majestic (extinct) San Francisco Peaks, the highest of all mountains in Arizona, rising 5,000 feet above the surrounding plateau. The San Francisco volcanic field is an area of volcanoes in northern Arizona, north of Flagstaff, US.The field covers 1,800 square miles (4,700 km²) of the southern boundary of the Colorado Plateau.The field contains 600 volcanoes ranging in age from nearly 6 million years old to less than 1,000 years (Miocene to Holocene), of which Sunset Crater is the youngest. Explore More Sunset Crater Volcano National Monument: Tickets & Tours‎ ... Our airbnb faces the San Francisco peaks so we are enjoying this view on a daily basis but the drive to the top - snowbowl, was incredible! Less widely known are the hundreds of geologically young volcanoes scattered across the southern portion of the Colorado Plateau at the eastern foothills of the San Francisco Peaks. San Francisco Peaks, three summits— Humphreys, Agassiz, and Fremont peaks—on the rim of an eroded extinct volcano 10 miles (16 km) north of Flagstaff on the Colorado Plateau in north-central Arizona, U.S. Humphreys Peak (12,633 feet [3,851 metres]) is the state’s highest point, and from it places Northern Arizona is best known for the Grand Canyon. Northern Arizona has two of the three major types of volcanoes; it is only missing shield volcanoes. Most of the more than 600 volcanoes in the region are cinder cones, although none are as large as the youngest, Sunset Crater. Less widely known are the hundreds of geologically young volcanoes scattered across the southern portion of the Colorado Plateau at the eastern foothills of the San Francisco Peaks.