arizona_volcanoes.AST20031021_lrg.jpg . EMBED. remove-circle Share or Embed This Item. San Francisco Peaks Volcano Field: Image of the Day Item Preview arizona_volcanoes.AST20031021.jpg . (Credit: Brugger-Schorr, Carrie. San Francisco Mountain is a composite volcano comprising layers of weak, unconsolidated of volcanic tephra (ash, lapilli and bombs) alternating with competent, dense lava flows. Eruptions built the peak between 1 million and 400,000 years ago. San Francisco Peaks: Extinct volcano fun - See 251 traveler reviews, 73 candid photos, and great deals for Flagstaff, AZ, at Tripadvisor. Hiking. 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 Peaks are what remains of a stratovolcano that was eroded. Public domain.) San Francisco Peaks in the San Francisco Volcanic Field are located outside of Flagstaff Arizona. Volcanic activity in the San Francisco Peaks began about 1.3 million years ago and ended about 100,000 years ago; making it the longest lived volcanic center in the field. Despite the extinct volcanoes, Arizona is actually home to a prominent volcanic field that is still active! Hazards from future eruptions would have local impacts. Humphrey's Peak is the point of the range at 12,633 feet high. The gentle slopes at far right and far left project upward toward the center, giving an idea of how high this mountain used to be, … The remnants of a dormant volcano, the peaks are home to some of the most spectacular hikes in the state, including a trail that leads you to the summit of Humphreys Peak, with an elevation of 12,633 feet. The San Francisco Volcanic Field covers 1,800 square mile in northern Arizona with volcanoes that are up to 6 million years old. A large portion of the water supply for Flagstaff, Arizona is found in the mountain. Yup, the San Francisco Peaks are an extinct stratovolcano which last erupted some 200,000 years ago. The Coconino National Forest surrounds the mountain. The breathtaking beauty of the San Francisco Peaks has been, and continues to be, molded by the forces of nature. 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 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. 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