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Dinosaur Classification Fossils Tyrannosaurus rex Theropods Evolution Avialae Stegosaurus Pterosaurs Non-avian Dinosaurs Ankylosaurs Tyrannosaurus Rex Sauropods Extinction Ceratosaurus Extinction Events Tyrannosaurs Behavior Feathered Dinosaurs Tyrannosaurus Edmontosaurus Birds Ankylosaurids New Dinosaur Species Megaraptora Diet Cretaceous Period Footprints Nanotyrannus Dinosaur Behavior Dinosauria Species Bird Evolution Theropoda Spinosaurus Fossil Record Dinosaur Species Extinct Species Evolutionary Biology Prehistoric Life Prey Fona herzogae Avian Dinosaurs Herbivorous Dinosaurs Caenagnathids Dietary Habits Iguanodontians Ornithopods Kulindadromeus New Species Fossil Evidence Ecology Pachycephalosaurus Therizinosaurs Feathers Growth Gorgosaurus Oviraptorosaurs Joaquinraptor Thescelosaurus Megaraptor Tyrannosaurus genus Tyrannosaurus mcraeensis Sauropodomorphs Hell Creek Formation Caudipteryx Discovery Feeding Habits Dinosaur Locomotion Evolutionary Success Apatosaurus Dinosaur Evolution Characteristics Dinosaur Footprints Body Size Tracks Raptor Dinosaurs Distribution Physical Characteristics Comparison Velociraptor Skeletal Remains Stegosaurs Crocodilians Deinosuchus Dromaeosauridae Maleriraptor kuttyi Genetics Spicomellus afer Research Methods Cultural Representation Nonavian Dinosaurs Species Interaction Herding Behavior Neornithes Megaraptoridae Cultural Events Predation Kostensuchus atrox Exhibitions Spicomellus
Isotope data from the Hell Creek find point to a late-Cretaceous freshening of the Western Interior Seaway that drew marine predators into river habitats.
