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Slumgullion Slide
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Slumgullion Pass is named for the nearby Slumgullion Slide or Earthflow, a gigantic landslide whose yellowish soil reminded early settlers and miners of slumgullion stew.
The Slumgullion Slide began about 700 years ago when weak volcanic tuff and breccia on the southern flank of Mesa Seco slumped several miles down the steep mountainside. Approximately 300 years ago, a second earthflow started from the top of the mountain and is still active, moving as much as twenty feet (six meters) per year. Trees growing on the newer slide are tipped at odd angles.
The first flow was so large and cataclysmic, it blocked the Lake Fork of the Gunnison River and created Lake San Cristobal, Colorado's second largest natural lake.
Source: Wikipedia
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