The Snowy Range Formation is a

geologic formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...

Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...

. It preserves

fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

dating back to the

Cambrian The Cambrian ( ) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordov ...

period Period may refer to: Common uses * Period (punctuation) * Era, a length or span of time *Menstruation, commonly referred to as a "period" Arts, entertainment, and media * Period (music), a concept in musical composition * Periodic sentence (o ...

. It contains characteristic flat pebble conglomerate which sometimes show distinctive red rims Myrow, P.M., Tice, L., Archuleta, B., et al., Flat-Pebble Conglomerate: Its Multiple Origin and Relationship to Metre-Scale Depositional Cycles, Sedimentology, 2004, vol. 51, no. 5, pp. 973–996. Snowy Range Fm

References

* Cambrian Montana Cambrian southern paleotropical deposits Conglomerate formations of the United States Geologic formations of Montana {{Cambrian-stub

See also

References