Frontier Formation
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.
| Frontier Formation Stratigraphic range: Cenomanian | |
|---|---|
| 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] |
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
- Nodosaurus textilis
- Stegopelta landerensis - "Partial postcranium, osteoderms, [and] fragments of skull."[4]
gollark: That why was rhetorical.
gollark: As I said on the forums:```That makes sense. If many new eggs are being introduced to the system, then that will most affect the stuff which is rarest, by making it rarer by comparison, but commons will stay the same. As for why it happened now? Weekly updates, possibly.```
gollark: Why?
gollark: I think it's just halloween.
gollark: Isn't emergent behavior *fun*?
See also
- List of dinosaur-bearing rock formations
References
- 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.
- "Table 17.1," in Weishampel, et al. (2004). Page 367.
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