| 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 |
TheKootenai Formation is aLower Cretaceousgeologic formation. The Kootenai was deposited in aforeland basin east of theSevierthrust belt in western Montana. The lithology consists of a basalconglomerate with overlying non-marinesandstones,shales and lacustrinelimestones.[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 specificgenus.[2]
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