The Denver Museum of Nature and Science announced the discovery of a nearly 67.5-million-year-old herbivorous dinosaur fossil beneath its parking lot. The fossil was found approximately 763 feet (about 240 meters) underground during geothermal energy testing in January 2025. This find marks the oldest and deepest dinosaur fossil ever uncovered within Denver city limits. The museum, known for its dinosaur exhibits, described the discovery as rare and historically important. The fossil site is located near the park where the Denver Zoo is situated. Experts have highlighted the uniqueness of this find given its depth and age. Additionally, researchers have uncovered evidence of one of the largest dinosaur mating "dance arenas" in present-day Colorado, further contributing to the region's paleontological significance.