150 Million-Year-Old Giant Dinosaur Footprints Found in Colorado

A remarkable set of dinosaur footprints in Colorado, dating back 150 million years, has provided scientists with fresh insights into the movements of these ancient giants. The findings were published on November 20 in the journal Geomatics under the title "Track by Track: Revealing Sauropod Turning and Lateralised Gait at the West Gold Hill Dinosaur Tracksite".

The study, led by University of Queensland paleontologist Anthony Romilio and his team, analyzed the Gold Hill Dinosaur Tracksite in Bluff Sandstone, Colorado, a location known for decades. By using drones and detailed per-step spatial analysis, researchers uncovered new details about the dinosaur's behavior.

The team discovered that the massive sauropod may have been limping as it left its footprints. Romilio told Sci News that the tracks date back to the Late Jurassic, when long-necked dinosaurs such as Diplodocus and Camarasaurus roamed North America. He added that the trackway is unique because it forms a complete loop.

Romilio explained that variations in the left and right step lengths could indicate either a limp or a natural preference for one side. The University of California Museum of Paleontology notes that sauropods were quadrupedal, herbivorous, and had a relatively uniform body structure among the group.

While the reason for the dinosaurs looping path remains unknown, the trackway provides a rare opportunity to study how a giant sauropod navigated a tight turn before resuming its original direction, Romilio said.

The Colorado site contains an exceptionally long series of footprints, with 134 initially recorded and 131 confidently mapped. Researchers isolated a fully looped subsection for detailed study. Drones allowed the team to capture images from areas difficult to access, revealing a trackway of more than 130 footprints that shows a nearly complete (~360) directional change and alternating long and short steps.

The land, located near Ouray, Colorado, was acquired by the U.S. Forest Service in 2024 after being privately owned since the late 1950s. The tracks were preserved in a thick, orangish-brown, near-horizontal silicified sandstone known locally as the "Lower Quartzite," which helped maintain the footprint details over millions of years.

Romilio described the dinosaurs movement: it started walking northeast, completed a full loop, and ended facing the same direction, with subtle yet consistent clues about its behavior. Notably, the spacing between left and right footprints varied, shifting from narrow to wide, suggesting nuanced movement patterns.

This discovery offers paleontologists an unprecedented glimpse into the locomotion of sauropods, enriching our understanding of how these colossal creatures moved through their environment.

Author: Sophia Brooks