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Humphreys and San Francisco Peaks # 10510

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Date: 2003.07.22
Vantage Point: From Highway to the E

Caption: Humphreys Peak which is the second peak visible from the right edge. The rest of the peaks are known as the San Francisco Peaks. All are volcanic in origin as the whole mountain is a dormant volcano and located in the San Francisco Volcanic Field. The valley between them all is known as the Interior Valley or Basin.

PhotoDescr: Humphreys is the highest point in Arizona and the San Francisco Peaks are the next 5 highest, then comes Baldy Peak after that.

This mountain was also subject to naming issues similar to Mount Lougheed in Alberta. Initial maps created in the area from the first surveyors called it San Francisco Mountain, but these were not referenced when the mountain was named after General Andrew A. Humphreys. After discovering this they kept Humphreys Peak but called the other peaks the San Francisco Peaks. To confuse things further, if you use USGS maps there are different names applied to each of the San Francisco Peaks.

The following is from the USGS site: "At its maximum height, the ancient volcano may have approached 16,000 feet in elevation. The volcano then experienced a collapse, either by gravity-induced landslide or a lateral blast eruption similar to the 1980 eruption of Mount St. Helens. This event created the great bowl-shaped amphitheater in the upland area east of Humphreys Peak. During the ice ages of the Pleistocene Epoch (between about 1.8 million to about 15,000 years ago), small glaciers carved the upper mountainsides of Humphreys Peak and surrounding summit area. San Francisco Mountain and the surrounding forested landscape are part of the Coconino National Forest".

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