How a huge landslide shaped Zion National Park:
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.
Read more at: https://phys.org/news/2016-05-huge-landslide-zion-national.html#jCp
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