Kootenai Formation
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]
| 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 |
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
References
- 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
- 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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