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.

A natural history museum in Denver famed for its dinosaur exhibits made a one-in-a-million discovery this week after a prehistoric fossil was found underneath its parking lot. While drilling a 750-foot borehole to assess geothermal heating potential at the Denver Museum of Nature and Science,

The partial vertebra appeared inside a 2.5-inch-diameter column of rock that researchers drilled, earning the title of the oldest and deepest dinosaur fossil found in Denver