Kootenai Formation

Short description: Geologic formation in Montana/Idaho, U.S.

Kootenai Formation
Stratigraphic range: Aptian-Albian

Typical Kootenai Formation in a roadcut. Sunburst Sandstone Member overlying the red informally named member 2. Cascade County, Montana.

Type| Geological formation
Sub-units| Cut Bank Sandstone Member, Moulton Member, Pryor Conglomerate Member, Sunburst Sandstone Member.
Underlies| Blackleaf Formation
Overlies| Morrison Formation unconformably
Thickness| 75 to 195 metres (246 to 640 ft)
Lithology
Primary| Nonmarine mudstones, siltstones and sandstones
Location
Region| Montana, Idaho
Country| United States
Type section
Named for| Kootenai Tribe who occupied western Montana and Alberta

The Kootenai Formation is a Lower Cretaceous geologic formation. The Kootenai was deposited in a foreland basin east of the Sevier thrust belt in western Montana. The lithology consists of a basal conglomerate with overlying non-marine sandstones, shales and lacustrine limestones.[1]

The most common fossils found within the Kootenai Formation are gastropod, ostracod, and pelecypod shells. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[2]

## See also

* List of dinosaur-bearing rock formations
* List of stratigraphic units with indeterminate dinosaur fossils

## References

1. ↑ Decelles, P. G., Sedimentation in a tectonically partitioned, nonmarine foreland basin: The Lower Cretaceous Kootenai Formation, southwestern Montana, GSA Bulletin, 1997, v. 97 no. 8 p. 911-931
2. ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.

### Bibliography

* Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 0-520-24209-2

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