Frontier Formation

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Frontier Formation
Stratigraphic range: Late Cretaceous
Type Geological formation
Sub-units Torchlight Sandstone Member, Peay Sandstone Member
Underlies Cody Shale
Overlies Mowry Shale, Thermopolis Shale
Primary sandstone
Other shale
Region North America
Country United States
Extent see text
Type section
Named by W. C. Knight, 1902[1]

The Frontier Formation is a sedimentary geological formation whose strata date back to the Late Cretaceous. The formation's extents are: northwest Colorado, southeast Idaho, southern Montana, northern Utah, and western Wyoming. It occurs in many sedimentary basins and uplifted areas.

The formation is described by W.G. Pierce as thick, lenticular, grey sandstone, gray shale, carbonaceous shale, and bentonite.[2]

Dinosaur remains are among the fossils that have been recovered from the formation.[3]

Vertebrate paleofauna[edit]

See also[edit]


  1. ^ W.C. Knight, 1902, Eng. and Min. Jour., v. 73, p. 721
  2. ^ Pierce, W.G., 1997, Geologic map of the Cody 1 degree x 2 degrees quadrangle, northwestern Wyoming: U.S. Geological Survey, Miscellaneous Geologic Investigations Map I-2500, scale 1:250000.
  3. ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.
  4. ^ "Table 17.1," in Weishampel, et al. (2004). Page 367.