Kootenai Formation

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Kootenai Formation
Stratigraphic range: Early Cretaceous
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.[1]

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[edit]



  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.