The McDowell Mountains, 20 miles northeast of the Phoenix metro area, are home to one of Arizona's largest landslides. About 500,000 years ago, a portion of the east-central summit of the McDowell Mountains suddenly collapsed into a catastrophic rock avalanche.
The Marcus Landslide is a stark reminder that landslide hazards are present in the mountains of the American Southwest.
Photo Credit: Brian Gootee, Arizona Geological Survey
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