Dinosaur Footprints Revealed In Texas Drought Ancient dinosaur footprints have been revealed in northwest Texas after a severe drought caused the Paluxy River to almost dry up. Multiple tracks belonging to the Acrocanthosaurus and Sauroposeidon dinosaurs were discovered in the river and date back over 100 million years. The river runs through Dinosaur Valley state park, where the large creatures once inhabited. Experts believe the Acrocanthosaurus was preying on the Sauroposeidon, explaining why