Overview
- Researchers published a peer-reviewed study on September 8, 2026, describing a roughly 23-foot sequence of four three-toed footprints from the Hell Creek Formation that they say were likely made by an adult Tyrannosaurus rex.
- Each footprint measures about three feet long and the spacing gives an estimated 13-foot stride and a walking speed near 3.5 to 4.5 miles per hour, though the team notes the speed is approximate because the tracks are heavily weathered.
- The site was found in 2025 on U.S. Forest Service land near Marmarth, North Dakota, by high school teacher and volunteer Kent M. Hups, who is a co-author on the paper.
- The prints were documented with high-resolution 3D surface scanning that produced digital models and physical reproductions, but the footprints are preserved as calcium-carbonate-cemented sandstone casts that are fractured and lack fine anatomical detail.
- Three of the four prints are planned to be airlifted to the Denver Museum of Nature & Science this fall for in-person study and public updates this winter, which the museum says will allow further analysis and display.