Appekunny Formation is a thick rock strata located in the Lewis Range within Glacier National Park. The formation is primarily mudstone and siltstone laid out in a shallow sea during the proterozoic. The Appekunny Formation contains bedding structures, which have being classified as the remains of the possibly oldest metazoan (animal) on Earth, pushing the limits of the origin of the metazoans one billion years back. Glacier National Park is located in the U.S. state of Montana, on the international border with the Canadian provinces of Alberta and British Columbia. ... Mudstone is a fine-grained sedimentary rock whose original constituents were clays or muds. ... Categories: Stub | Sedimentary rocks ... In geology, the Proterozoic is an eon prior to the first abundant complex life on earth. ... Phyla Subkingdom Parazoa Porifera (sponges) Subkingdom Agnotozoa Placozoa Orthonectida Rhombozoa Subkingdom Metazoa Radiata Cnidaria Ctenophora - Comb jellies Bilateria Protostomia Acoelomorpha Platyhelminthes - Flatworms Nemertina - Ribbon worms Gastrotricha Gnathostomulida - Jawed worms Micrognathozoa Rotifera - Rotifers Acanthocephala Priapulida Kinorhyncha Loricifera Entoprocta Nematoda - Roundworms Nematomorpha - Horsehair worms Cycliophora Mollusca - Mollusks Sipuncula - Peanut worms Annelida - Segmented...

The Appekunny Formation is named after Appekunny Mountain and averages 1,970 feet (601 m) thick. The rock strata has been dated at between 1.2–1.4 billion years old.

External links

• 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.
• Park Geology. Geology Fieldnotes. URL accessed on 2006-04-29.
• Price, Mike (January - March 2006). Virtual Geomorphology. (pdf) URL accessed on 2006-04-29.