Northern Arizona’s San Francisco Volcanic Field is a prominent geological landmark in the Southwest. Comprised of about 1,800 square miles, it is the location of more than 600 volcanic vents in the ...
The 714,566 hectare site comprises two distinct parts: the dormant volcanic Pinacate Shield of black and red lava flows and desert pavements to the east, and, in the west, the Gran Altar Desert with ...
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