The Cook Ranch 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 ...
in
Montana
Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columbi ...
. 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 in ...
dating back to the
Paleogene
The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million yea ...
period.
See also
*
List of fossiliferous stratigraphic units in Montana
This article contains a list of fossil-bearing stratigraphic units in the state of Montana, U.S.
Sites
See also
* Paleontology in Montana
References
*
{{DEFAULTSORT:Fossiliferous stratigraphic units in Montana
Montana
Stratigraphic u ...
*
Paleontology in Montana
References
*
Paleogene Montana
{{Paleogene-stub