 The Glen Rose Formation of central Texas preserves many dinosaur footprints , including large , three @-@ toed theropod prints . The most famous of these trackways was discovered along the <unk> River in Dinosaur Valley State Park , a section of which is now on exhibit in the American Museum of Natural History in New York City , although several other sites around the state have been described in the literature . It is impossible to say what animal made the prints , since no fossil bones have been associated with the trackways . However , scientists have long considered it likely that the footprints belong to Acrocanthosaurus . A 2001 study compared the Glen Rose footprints to the feet of various large theropods but could not confidently assign them to any particular genus . However , the study noted that the tracks were within the ranges of size and shape expected for Acrocanthosaurus . Because the Glen Rose Formation is close to the Antlers and Twin Mountains Formations in both geographical location and geological age , and the only large theropod known from those formations is Acrocanthosaurus , the study concluded that Acrocanthosaurus was most likely to have made the tracks . 
