Colorado dinosaur discovery – Haplocanthosaurus

Haplocanthosaurus skeleton from Colorado
This Haplocanthosaurus skeleton at the Cleveland Museum of Natural History was recovered from Garden Park near Cañon City by four students between 1955 and 1957. | Photo by Scott Robert Anselmo /


The Haplocanthosaurus was first discovered in Garden Park near Cañon City by paleontologists J.B. Hatcher and W. Utterback from Pittsburgh’s Carnegie Museum of Natural History in 1901 and was named by Hatcher in 1903.

A larger version of the dinosaur was recovered from a nearby quarry by Yale University zoology student Edwin Delfs and three Cleveland high school students between 1955 and 1957 and is displayed at the Cleveland Museum of Natural History, though with a replica skull because the skull was not recovered.

The typical Haplocanthosaurus stood on four legs with a long neck and tail and is one of the smaller plant-eating dinosaurs, with a length of 49 feet and a weight of 14 tons. It lived in the late Jurassic period.