The St. Mary River Formation is a geological formation in Alberta, Canada whose strata date back to the Late Cretaceous

Late Cretaceous

The Late Cretaceous is the younger of two epochs into which the Cretaceous period is divided in the geologic timescale. Rock strata from this epoch form the Upper Cretaceous series...

. Dinosaur remains are among the fossils that have been recovered from the formation. The St. Mary River Formation has produced only a few dinosaur fossils in its Albertan outcrops. The St. Mary River Formation outcrops in southwest Alberta.

Ornithischians

Ornithischians reported from the St. Mary River Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Anchiceratops Anchiceratops Anchiceratops is a genus of chasmosaurine ceratopsid dinosaur from the Late Cretaceous Period of western North America. Like other ceratopsids, it was a quadrupedal herbivore with three horns on its face, a parrot-like beak, and a long frill extending from the back of its head. The two horns above...	A. ornatus	Yukon			Remains later found to be referrable to Anchiceratops, but it's not known what species.
	Indeterminate	Yukon
Edmontonia Edmontonia Edmontonia was an armoured dinosaur, a part of the nodosaur family from the Late Cretaceous Period. It is named after the Edmonton Formation , the unit of rock it was found in.-Description:...	E. longiceps	Yukon
Edmontosaurus Edmontosaurus Edmontosaurus is a genus of crestless hadrosaurid dinosaur. It contains two species: Edmontosaurus regalis and Edmontosaurus annectens. Fossils of E. regalis have been found in rocks of western North America that date from the late Campanian stage of the Cretaceous Period 73 million years ago,...	E. regalis	Yukon
	Indeterminate	Alberta
Montanoceratops Montanoceratops Montanoceratops was a genus of small ceratopsian dinosaur. It lived during the early Maastrichtian of the late Cretaceous Period...	M. cerorhynchus	Montana
Pachyrhinosaurus Pachyrhinosaurus Pachyrhinosaurus is a genus of ceratopsid dinosaurs from the Late Cretaceous period of North America. The first examples were discovered by Charles M. Sternberg in Alberta, Canada, in 1946, and named in 1950. Over a dozen partial skulls and a large assortment of other fossils from various species...	P. canadensis	Alberta Yukon

Theropods

Theropods reported from the St. Mary River Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Albertosaurus Albertosaurus Albertosaurus is a genus of tyrannosaurid theropod dinosaur that lived in western North America during the Late Cretaceous Period, more than 70 million years ago. The type species, A. sarcophagus, was apparently restricted in range to the modern-day Canadian province of Alberta, after which...	Indeterminate	Alberta Yukon
Saurornithoides Saurornithoides Saurornithoides is a genus of troodontid maniraptoran dinosaur, living during the Late Cretaceous period. These creatures were predators, which could run fast on their hind legs and had excellent sight and hearing...	Indeterminate	Alberta
Saurornitholestes Saurornitholestes Saurornitholestes is a genus of carnivorous dromaeosaurid theropod dinosaur from the late Cretaceous of Alberta, Montana and New Mexico....	Indeterminate	Yukon
Troodon Troodon Troodon is a genus of relatively small, bird-like dinosaur from the Late Cretaceous period . Discovered in 1855, it was among the first dinosaurs found in North America...	Indeterminate	Alberta Yukon