O'Leary Peak is an extinct Pleistocene lava dome volcano within the San Francisco volcanic field, north of Flagstaff, Arizona, and to the northwest of Sunset Crater National Monument. A fire lookout tower was built on a subsidiary eastern peak. It has an elevation of 8,919 feet (2,719 m). * View of the San Francisco Peaks from O'Leary Lookout, 2009 * Sample of andesite porphyry from summit of O'Leary peak