Geology and History
Geology and History
Geology and history of San Francisco Volcanic Field.
Sunset Crater
Sunset Crater
Sunset Crater is one of the youngest scoria cones in the contiguous U.S. and is the youngest of about 600 such cones in the San Francisco Volcanic Field.
San Francisco Mountain
San Francisco Mountain
San Francisco Mountain is a stratovolcano in the San Francisco Volcanic Field and was built by eruptions between about 1 million and 93,000 years ago.
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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.
San Francisco Mountain
San Francisco Mountain is a stratovolcano in the San Francisco Volcanic Field and was built by eruptions between about 1 million and 93,000 years ago.