page_title: Appekunny Formation
hierarchical_section_title: Appekunny Formation
caption_attribution_description: English: string of beads fossil Horodyskia moniliformis from the 1.4 Ga Appekunny Argillite in Glacier National Park, Montana
context_page_description: 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. The Appekunny Formation contains bedding structures which may include the remains of the oldest metazoan on Earth known by the species name Horodyskia moniliformis.
  The Appekunny Formation is named after Apikuni Mountain and averages 1,970 feet thick. The rock strata have been dated at between 1.2–1.4 billion years old.
context_section_description: 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. 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.
  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.
caption: Horodyskia moniliformis Is one of the oldest forms of multicellar metaozoan life known
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