The Denver Museum of Nature and Science is filled with exhibits of dinosaur skeletons. And in the scientific equivalent of tossing couch cushions, its scientists discovered a dinosaur fossil deep — really deep — below the surface of one of its own parking lots, the museum announced this week.

Officials stumbled upon a 67-million-year-old dinosaur bone beneath the Denver Museum of Nature and Science during a drilling project, the DMNS announced on Wednesday.

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.