Williams Fork Formation

The Williams Fork Formation is a Campanian (Edmontonian) geologic formation of the Mesaverde Group in Colorado. Dinosaur remains are among the fossils, most notably Pentaceratops sternbergii,[1] that have been recovered from the formation, although none have yet been referred to a specific genus.[2] Other fossils found in the formation are ammonites, Neosuchia, and the mammal Meniscoessus collomensis.[3][4]

Williams Fork Formation Stratigraphic range: Campanian (Edmontonian) ~84–71 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Mesaverde Group
Lithology
Primary	Mudstone
Other	Sandstone
Location
Coordinates	40.0°N 108.8°W / 40.0; -108.8
Approximate paleocoordinates	47.5°N 80.3°W / 47.5; -80.3
Region	Colorado
Country	United States
Williams Fork Formation (the United States) Show map of the United States Williams Fork Formation (Colorado) Show map of Colorado

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with indeterminate dinosaur fossils

References

1. Diem, Steve; Archibald, James D. (2005). "Range extension of southern chasmosaurine Ceratopsian dinosaurs into northwestern Colorado". Journal of Paleontology. 79 (2): 251–258. CiteSeerX 10.1.1.538.7263. doi:10.1666/0022-3360(2005)079<0251:REOSCC>2.0.CO;2. Retrieved 21 September 2016.
2. Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
3. Jubb Creek at Fossilworks.org
4. Rangely South (SDNHM) at Fossilworks.org

Bibliography

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

Further reading

• J. R. Foster and R. K. Hunt-Foster. 2015. First report of a giant neosuchian (Crocodyliformes) in the Williams Fork Formation (Upper Cretaceous: Campanian) of Colorado. Cretaceous Research 55:66-73
• W. J. Kennedy, W. A. Cobban, and G. R. Scott. 2000. Heteromorph ammonites from the Upper Campanian (Upper Cretaceous) Baculites cuneatus and Baculites reesidei zones of the Pierre Shale in Colorado, USA. Acta Geologica Polonica 50:1-20
• J. A. Lillegraven. 1987. Stratigraphic and evolutionary implications of a new species of Meniscoessus (Multituberculata, Mammalia) from the Upper Cretaceous Williams Fork Formation, Moffat County, Colorado. Dakoterra 3:46-56
• Sullivan, R.M., and Lucas, S.G. 2006. "The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America." New Mexico Museum of Natural History and Science, Bulletin 35:7-29.