First Adult T. Rex Trackway Discovered in N.D.
Scientists documented the first adult Tyrannosaurus rex trackway in the Hell Creek Formation of North Dakota, a 23-foot sequence of four tridactyl footprints dating to about 66.5 million years ago, analyzed with 3D scans to reveal gait and behavior. Found in 2025 on federal land near Marmarth, the tracks suggest a leisurely pace of roughly 3.5 to 4.5 mph as researchers plan further excavations and 3D reproductions.
Science · 36 sources · Sep 14, 2026Read it
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About Hell Creek Formation
The Hell Creek Formation is an intensively studied division of mostly Upper Cretaceous and some lower Paleocene rocks in North America, named for exposures studied along Hell Creek, near Jordan, Montana. The formation stretches over portions of Montana, North Dakota, South Dakota, and Wyoming. In Montana, the Hell Creek Formation overlies the Fox Hills Formation. The site of Pompeys Pillar National Monument is a small isolated section of the Hell Creek Formation. In 1966, the Hell Creek Fossil Area was designated as a National Natural Landmark by the National Park Service.
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