No, they aren’t the latest rage at your local water park, but three volcano-related slides found in southwest Utah are believed to be the largest and oldest landslides in Earth’s history. Each of the slides was likely the result of “a single catastrophic event” 18 to 25 million years ago, and each probably “lasted only minutes.”  The Marysvale gravity slide complex, as it’s known is huge — covering nearly 3,000 square miles, “almost as large as Yellowstone National Park.”


Read full story on: Salt Lake Tribune