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Slumgullion Earthflow


Slumgullion Earthflow is an excellent illustration of the geologic process of mass wasting. Seven hundred years ago, a huge mass of volcanic rock slumped from the mountainside and flowed into the main valley where it spread laterally to form Lake San Cristobal. The older flow of Slumgullion is presently being overridden by a new flow moving up to 20 feet per year. Ownership: Federal, private.

The Slumgullion Earth-flow and Lake San Cristobal in Colorado
The Slumgullion Earthflow Moves up to 20 Feet Per Year


Designation Date: 1965

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