Slumgullion earthflow - wikipedia Slumgullion earthflow Slumgullion Earthflow Location Hinsdale County, Colorado, United States Nearest city Lake City, Colorado Coordinates 37 ° 59 ′ 30 '' N 107 ° 15 ′ 25 '' W ﻿ / ﻿ 37.991665 ° N 107.25704 ° W ﻿ / 37.991665 ; - 107.25704 Coordinates : 37 ° 59 ′ 30 '' N 107 ° 15 ′ 25 '' W ﻿ / ﻿ 37.991665 ° N 107.25704 ° W ﻿ / 37.991665 ; - 107.25704 U.S. National Natural Landmark Designated Lake San Cristobal was created 700 years ago when the Slumgullion Earthflow created a dam. The Slumgullion Earthflow in the San Juan Mountains in Hinsdale County, Colorado has been a National Natural Landmark since 1983. It is also a Colorado Natural Area and an Area of Critical Environmental Concern. The earthflow, a slow moving landslide, crawled down the valley about 700 years ago creating the 4 miles ( 6.4 km ) long and 2,000 feet ( 610 m ) wide mass. The earthflow lies a few miles south east of Lake City. The landmark site covers 1,291 acres ( 522 ha ) and is owned by the US Forest Service and the Bureau of Land Management. It is `` a striking example of mass wasting ( the movement of large masses of earth material ). '' Lake San Cristobal was dammed by the earthflow. A second earthflow has been moving continuously for about 300 years over older stable rock. It moves at a rate of about 7 meters ( 23 feet ) per year. The area is a habitat for elk and deer. References ^ Jump up to : `` Slumgullion Earthflow ''. Colorado Parks and Wildlife. Archived from the original on August 27, 2012. Retrieved July 5, 2013. ^ Jump up to : `` Slumgullion Earthflow ''. U.S. Department of the Interior - Bureau of Land Management. Retrieved July 5, 2013. ^ Jump up to : D.J. Varnes and W.Z. Savage, ed. ( March 23, 2012 ). `` Bulletin 2130 - The Slumgullion Earth flow : A Large - Scale Natural Laboratory ''. US Department of Interior - US Geological Survey. Retrieved July 5, 2013. Jump up ^ Hagenauer, Beth ( October 8, 2012 ). `` NASA Conducts Airborne Study of Colorado Landslide ''. NASA Dryden Flight Research Center. Retrieved May 9, 2014. 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Question: what type of mass movement is the slumgullion slide
Answer: a slow moving landslide