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Geologic Hazards

A 1-Minute ‘Rock Avalanche’ 4,800 Years Ago In Zion National Park

June 14, 2016 rockman Comments Off on A 1-Minute ‘Rock Avalanche’ 4,800 Years Ago In Zion National Park

Imagine the scene 4,800 years ago when a rock avalanche nearly 2 km long buried much of the Zion Valley in a matter of 90 seconds, creating a dam on the Virgin River that flooded […]

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