The Beginning of the Age of Dinosaurs: Faunal Change Across the Triassic-Jurassic Boundary
Around 210 million years ago, life on Earth experienced sweeping changes. Many archaic reptiles and mammalian predecessors became extinct and were replaced by dinosaurs, pterosaurs, crocodiles, turtles, mammals, and essentially all of the major modern vertebrate groups except the birds. This period of change, which took place over a period of approximately five to ten million years, ushered in the beginning of the ‘Age of Dinosaurs,’ a period that lasted 160 million years to the end of the Cretaceous 65 million years ago. In the past decade, paleontologists have come to know a great deal more about this crucial interval of time. New discoveries, ideas, and insights from scientists in many related- disciplines have created new paradigms about the beginning of the ‘Age of Dinosaurs.’ What were the animals that preceded the dinosaurs like? How did the dinosaurs originate, and what do we know of their early history? Was their ascent tied to evolutionary innovations, global climatic and ecological changes, or just chance factors? How do paleontologists decide about the evidence preserved in the fossil record, and what areas now require major thought and reevaluation? In this book, 31 specialists in the paleontology of this era consider these and other questions related to Late Triassic and Early Jurassic times - the beginning of the ‘Age of Dinosaurs,’ its fauna, flora, climate, stratigraphic relationships, and major evolutionary changes. The book is divided into sections on background, Late Triassic taxa and faunas, changes across the boundary, Early Jurassic taxa and faunas, and major macroevolutionary patterns. This comprehensive volume is richly illustrated and is intended for students and professionals in the areas of paleontology, evolutionary biology, geology, and vertebrate zoology. Introductory and summary chapters are provided to acquaint the non-specialist with the issues and the setting of this interval of time in which the ancestral components of the modem f
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aetosaurs archosaurs Arizona assemblages astragalus Atreipus Baird Batrachopus Benton biostratigraphic Bonaparte Bull Cetiosauridae Chapter Charig Chinle Formation Coelophysis Colbert Cornet correlation County Cretaceous crocodilian Crompton dentary digit dinosaurs distal diversity Dockum Group dorsal Early Jurassic extinction facet faunas femur Figure footprints fossil genera genus Geol Glen Canyon Group herbivores Heterodontosaurus hindlimb Hitchcock Huene Kayenta Formation Keuper late Carnian Late Triassic Liassic locality Lower Jurassic Lufeng mammals manus material medial Member Mesozoic Middle Moenave Formation morphology Museum neural Newark Basin Newark Supergroup Norian North America Olsen and Galton ornithischian Padian Paleontol Paleontology Petrified Forest phytosaurs posterior prosauropods Protosuchus proximal Quarry Red Beds reptiles Rhaetian rhynchosaurs Rutiodon Sandstone Saurischia sauropods Scale sediments skull SMUSMP species specimens Stormberg stratigraphic taxa taxon taxonomic teeth terrestrial tetrapods Texas therapsids theropod tion tooth trackways Trias Triassic-Jurassic boundary tritylodontid tritylodonts UCMP Upper Triassic ventral vertebrate