Sunset Crater
Sunset Crater
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Geology and History of San Francisco Volcanic Field
The first volcanoes in the San Francisco Volcanic Field began to erupt about 6 million years ago, in an area where the town of Williams is now. Subsequently, a several-mile-wide belt of successively younger eruptions migrated eastward, to the area of modern Flagstaff, and beyond toward the valley of the Little Colorado River. Today, this belt of volcanoes extends about 50 miles from west to east.
Sunset Crater
Sunset Crater, located about 25 km (15 mi) northeast of Flagstaff, Arizona, is one of the youngest scoria cones in the contiguous United States and is the youngest of about 600 such cones in the San Francisco Volcanic Field.