Appekunny Formation

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Coordinates: 48°50′11″N 113°39′14″W / 48.8363690°N 113.6539971°W / 48.8363690; -113.6539971[1] Appekunny Formation is a thick series of rock strata located in the Lewis Range within Glacier National Park, in the U.S. state of Montana. The formation is primarily mudstone and siltstone deposited in a shallow sea during the Proterozoic. Not far from the eastern entrance to the Going-to-the-Sun Road at St. Mary, Montana, the formation can be easily seen on the slopes of Singleshot Mountain.[2] The Appekunny Formation contains bedding structures which may include the remains of the oldest metazoan (animal) on Earth.[3]

The Appekunny Formation is named after Apikuni Mountain and averages 1,970 feet (600 m) thick. The rock strata have been dated at between 1.2–1.4 billion years old.


  1. ^ "Apikuni Mountain". Geographic Names Information System. United States Geological Survey. Retrieved 2012-03-31. 
  2. ^ Dyson, James (1957). "The Belt Formations". The Geologic Story of Glacier National Park. National Park Service. Retrieved 2012-03-31. 
  3. ^ "Park Geology". Geology Footnotes. National Park Service. January 4, 2005. Retrieved 2012-03-31. 

Further reading[edit]

  • Raup, Omar; Robert L. Earhart; James W. Whipple; Paul E. Carrara (1983). Geology Along Going-to-the-Sun Road, Glacier National Park, Montana. West Glacier, Montana: Glacier Natural History Association. ISBN 0-934318-11-5. 
  • Price, Mike (January–March 2006). "Virtual Geomorphology" (pdf). Archived (PDF) from the original on 15 May 2006. Retrieved 2006-04-29.