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

A museum in Denver has found a fossil that is almost 70 million years old under its parking lot while running an unrelated drilling project. "This may be the most unusual dinosaur discovery I have ever been a part of," said Patrick O’Connor, director of Earth & Space Sciences at the Denver Museum of Nature & Science, in a statement.