The remains of three dinosaurs were discovered on Aug. 18 by City of Edmonton workers digging a new sewer tunnel 30 metres underground.
Workers Aaron Krywiak and Ryley Paul first noticed a sharp tooth while digging under a street near the city's river valley. "We knew it was pretty significant," Mr. Krywiak said.
Crews soon after discovered remains of an Albertosaurus (a carnivore that stood on two legs) and two Edmontosauruses (a four-legged herbivore), but that number could grow.
"There's lots of pieces. We haven't gotten through them all yet," said Don Brinkman, director of preservation and research at the province's Royal Tyrrell dinosaur museum, which will take the bones for its collection.
Albertosaurus was a smaller cousin of the carnivorous Tyrannosaurus rex that roamed the Earth about 75 million years ago.
An adult would measure about 10 metres from head to toe and its large head would be filled with sharp teeth.
The Edmontosaurus was a large, toothless dinosaur from the same time period which used to be preyed on by the T.-Rex.
Paleontologists have since overseen construction, and the find was announced Aug. 23. It is only the second such bone bed with two species ever discovered within the city, Mr. Brinkman said.
With a report from The Canadian Press