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How a huge landslide shaped Zion National Park

Phys Org   26 May 2016   USA   Utah  

A Utah mountainside collapsed 4,800 years ago in a gargantuan landslide known as a "rock avalanche," creating the flat floor of what is now Zion National Park by damming the Virgin River to create a lake that existed for 700 years.

 

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This view of Zion Canyon in Utah's Zion National Park shows the flat valley floor created when part of the peak named the Sentinel collapsed in a gigantic landslide.
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