Appekunny Formation
Geological feature in Montana, US
From Wikipedia, the free encyclopedia
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 known by the species name Horodyskia moniliformis.[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.
