Ancient Tyrannosaurus Trail Found in North Dakota: First Known Adult Trackway Revealed
Scientists studying the Hell Creek Formation near Marmarth, North Dakota, describe what appears to be the first known trackway of an adult Tyrannosaurus rex, featuring at least four three‑toed footprints over more than 23 feet with a fifth track later uncovered; high‑resolution 3D scans suggest the dinosaur walked about 3.5–4.5 mph, and researchers anticipate more footprints as digging continues.