A surprising dinosaur fossil discovery took place at Dinosaur National Monument, on the Colorado-Utah border. On September 16, 2025, construction crews upgrading a parking lot near the Quarry Exhibit Hall hit a sandstone layer full of fossils. This is the first find here in over a century. The workers stopped to let paleontologists carefully examine the bones to avoid damage. The fossils most likely belong to a large, long-necked dinosaur called Diplodocus, a common sauropod from the Late Jurassic period, says the National Park Service. The team—made up of park staff, volunteers, and the Utah Conservation Corps—removed around 3,000 pounds of rock and fossil material during the dig. These fossils are now being cleaned and studied at the Utah Field House of Natural History State Park Museum in Vernal. Some are already displayed at the Quarry Exhibit Hall. This find matters because it is the first excavation at this site since 1924, offering new data on dinosaur diversity and their ecosystem. Visitors get to watch fossil preparation live at the museum, offering a rare peek into paleontology work. Dinosaur National Monument is famous for its 'Wall of Bones,' a large section with about 1,500 dinosaur fossils frozen in place. These fossils come from an ancient riverbed where many creatures were buried millions of years ago. This discovery proves that even well-researched sites can still hide exciting new prehistoric treasures.