Kootenai Formation

Kootenai Formation
An outcrop of the Gastropod Limestone of the Kootenai Formation in western Montana.
Type	Geological formation
Sub-units	Basal Conglomerate, Lower Clastics, Lower Limestone, Upper Clastics, Gastropod Limestone
Underlies	Blackleaf Formation
Overlies	Morrison 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.

Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.