Oldman Formation

Oldman Formation Stratigraphic range: Upper Cretaceous, 77.5–76.5 Ma PreЄ Є O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Edmonton Group
Underlies	Bearpaw Formation, Dinosaur Park Formation
Overlies	Foremost Formation
Thickness	up to 328 feet (100 m)[1]
Lithology
Primary	Sandstone, shale, coal
Other	bentonitic beds
Location
Named for	Oldman River
Named by	Russell, L.S. and Landes, R.W., 1940[2]
Coordinates	49°37′41″N 112°53′23″W / 49.62806°N 112.88972°W / 49.62806; -112.88972 (Oldman Formation)Coordinates: 49°37′41″N 112°53′23″W / 49.62806°N 112.88972°W / 49.62806; -112.88972 (Oldman Formation)
Region	Western Canadian Sedimentary Basin
Country	Canada

The Oldman Formation is the middle member of the Judith River Group, a major geologic unit in southern Alberta. The formation is widely recognized as bearing a great number of well preserved dinosaur skeletons, as well as other fossils.

Age

The Oldman Formation was deposited during the middle Campanian, between 77.5 and 76.5 million years ago.^[3]

Relationship to other units

The formation is bounded by the Foremost Formation below and the Dinosaur Park Formation above. It lies fully within Chron 33n.

Fauna

List of dinosaurs found in the formation:^[4][3]

Theropods

Theropods reported from the Oldman Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Daspletosaurus	D. torosus		Upper through lower	Several specimens	A tryannosaurid	Daspletosaurus Dromaeosaurus Hesperonychus
Dromaeosaurus	Indeterminate			Teeth	A dromaeosaurid
Dromiceiomimus	D. brevitertius				Misreported
Elmisaurus	E. elegans				Misreported, found in the Dinosaur Park, Hell Creek, and Two Medicine Formations
Hesperonychus	H. elizabethae			Foot claw	A dromaeosaurid
Paronychodon	Indeterminate			Teeth	A troodontid
Ricardoestesia	R. isosceles				Misreported
	Indeterminate			Teeth	A dromaeosaurid
Saurornitholestes	S. langstoni			Partial remains	A dromaeosaurid
Troodon	T. formosus			Teeth, eggs, embryos	A troodontid, also found in the Dinosaur Park, Judith River, Lance, and Two Medicine Formations

Ornithischians

Ornithischians reported from the Oldman Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Albertaceratops	A. nesmoi		Lower		A ceratopsid	Albertaceratops Brachylophosaurus Chasmosaurus Parasaurolophus
Anchiceratops	Indeterminate				A ceratopsid
Brachylophosaurus	B. canadensis		Upper		A hadrosaurid
Centrosaurus	C. brinkmani		Upper		A ceratopsid, also found in the Dinosaur Park Formation
Chasmosaurus	C. brevirostris				Junior synonym of C. russelli.
	C. russelli		Upper		A ceratopsid, also found in the Dinosaur Park Formation
Corythosaurus	C. casuarius		Upper		A hadrosaurid, also found in the Dinosaur Park Formation
Euoplocephalus	E. tutus				An ankylosaurid, actually from the Bearpaw, Dinosaur Park and Judith River Formations
Gryposaurus	G. incurvimanus				Junior synonym of G. notabilis
	G. notabilis		Upper		A hadrosaurid, also found in the Dinosaur Park Formation
Hypacrosaurus	H. stebingeri				A hadrosaurid, actually from the Dinosaur Park Formation
Lambeosaurus	L. lambei				A hadrosaurid, actually from the Dinosaur Park Formation
Parasaurolophus	P. walkerii		Upper		A hadrosaurid, also found in the Dinosaur Park Formation

See also

	Earth sciences portal
	Paleontology portal
	Dinosaurs portal

• List of fossil sites (with link directory)
• List of dinosaur-bearing rock formations

Footnotes

1. ^ Lexicon of Canadian Geological Units. "Oldman Formation". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:011229. Retrieved 2009-02-06. 
2. ^ Russell, L.S. and Landes, R.W., 1940. Geology of the southern Alberta Plains; Geological Survey of Canada, Memoir 221.
3. ^ ^{a b} Arbour, V. M.; Burns, M. E.; and Sissons, R. L. (2009). "A redescription of the ankylosaurid dinosaur Dyoplosaurus acutosquameus Parks, 1924 (Ornithischia: Ankylosauria) and a revision of the genus". Journal of Vertebrate Paleontology 29 (4): 1117–1135. doi:10.1671/039.029.0405. 
4. ^ Weishampel, D.B., Barrett, P.M., Coria, R.A., Le Loueff, J., Xu X., Zhao X., Sahni, A., Gomani, E.M.P., & Noto, C.N. 2004. Dinosaur distribution. In: Weishampel, D.B., Dodson, P., & Osmólska, H. (Eds.). The Dinosauria (2nd Edition). Berkeley: University of California Press. Pp. 517-606.

References

• D.A. Eberth. 1996. Origin and significance of mud-filled incised valleys (Upper Cretaceous) in southern Alberta, Canada. Sedimentology 43:459–477
• Ryan, M. J., and Russell, A. P., 2001. Dinosaurs of Alberta (exclusive of Aves): In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, pp. 279-297.