Frontier Formation in Utah (Dinosaur National Monument)
Type
Geological formation
Sub-units
Torchlight Sandstone Member, Peay Sandstone Member
Underlies
Cody Shale
Overlies
Mowry Shale, Thermopolis Shale
Lithology
Primary
Sandstone
Other
Shale
Location
Region
North America
Country
United States
Extent
see text
Type section
Named by
W. C. Knight, 1902[1]
Giant concretions in the Frontier Formation, northern end of the San Rafael Swell, Emery County, Utah.
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]
^W.C. Knight, 1902, Eng. and Min. Jour., v. 73, p. 721
^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.
^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.
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The FrontierFormation is a sedimentary geological formation whose strata date back to the Late Cretaceous. The formation's extents are: northwest Colorado...
Late Cretaceous, the fossils of which are found exclusively in the FrontierFormation in Wyoming. Nodosaurus grew up to roughly 4 to 6 metres (13 to 20 ft)...
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Cretaceous in age, including the Lance Formation, Meeteetse Formation, Mesaverde Formation, Cody Shale, and FrontierFormation. As the rock strata in the basin...
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in diameter, are found associated with sandstone outcrops of the FrontierFormation in northeast Utah and central Wyoming. They formed by the early cementation...
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Cenomanian-age Lower and Upper Cretaceous Belle Fourche Member of the FrontierFormation of Fremont County, Wyoming, USA. In 1905, Samuel Wendell Williston...
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bed at the top of the Greenhorn Formation in Colorado, and alone in sandstone and shale in the upper FrontierFormation in Wyoming. The slightly younger...
Ridge, a North to South angled hogback that exposes the Cretaceous FrontierFormation sandstone. The next outcrop is White Mountain containing Mid-Eocene...
1130/GSAB-55-91. Molenaar, Cornelius M.; Wilson, B.W. (1990). "The FrontierFormation and associated rocks of northeastern Utah and northwestern Colorado"...
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