A 4-year old boy in Texas made a huge discovery while fossill hunting with his father.

According to the Dallas Morning News, Tim Brys, a keeper at the Dallas zoo, brought his son Wiley along with him to look for fossills at the site of a future shopping center in Mansfield, Texas. After finding some fish verterbrate, the boy found something much larger.

“[Wiley] walked up ahead of me and found a piece of bone,” Brys told the Dallas Morning News. “It was a pretty good size and I knew I had something interesting.”

reports that scientists at Southern Methodist University believe the bones belonged to a rare dinosaur known as a Nodosaur. The scientists described the Nodosaur as a herbivore that lived between the late Jurassic and early Cretaceous periods. According to Brys, the bones could even belong to a new species.

As of now, the bones are undergoing further study at SMU.