Fossils of an Edmontosaurus and an Albertosaurus were found while city workers were hand-tunneling in an Edmonton sewer tunnel.
According the Royal Tyrrell Museum's website: Albertosaurus was the top predator of its time, and was a close relative of Tyrannosaurus rex, who lived a few million years later. The first Albertosaurus was discovered by Joseph B. Tyrrell, a young geologist who was searching for coal seams in the Red Deer River valley in 1884. It is now the most common of the large carnivores found in Alberta.
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