The fossil, estimated to be about 70 million years old, was buried 763 feet below the surface and unearthed because of a drilling project.

The Denver Museum of Nature and Science made a surprise discovery during a project on the museum's parking lot: a 70 million-year-old dinosaur fossil.The fossil was discovered in January as the museum was conducting a drilling project to determine if it could transition from natural gas to geothermal energy.

A new dinosaur fossil at the Denver Museum of Nature & Science was found buried hundreds of feet under the facility's parking lot in January, making the herbivorous animal's remains the oldest and deepest dinosaur fossil ever discovered in the city.