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Triassic Period--Archosaurs and thecodonts
- Walking with Dinosaurs Chronology, BBC. Information about the animals of the Late Triassic, including the large thecodont, Postosuchus, and the Triassic dinosaurs Coelophysis and Plateosaurus. Based on the "Walking with Dinosaurs" video series.
- Dinosaur Evolution, University of Bristol, Department of Geology. Sections about the evolution of vertebrates leading to dinosaurs, classification of dinosaurs, evolution of archosaurs, evolution of birds, and the dinosaur evolutionary tree.
- Lecture 11--Great Triassic Assemblages, Columbia University, Lamont Doherty Earth Observatory. Maps and description of the Chinle Group (western United States), which is famous for its Triassic fossils. The site includes cladograms of archosaurs, diagrams showing changes in wrist structures among the archosaurs, and discussions of the phytosaurs, aetosaurs, ornithosuchia, and suchia, including Postosuchus, a famous, large carnivorous Triassic archosaur. If you continue to scroll down the page, there are also descriptions of Triassic dinosaurs from the Chinle, including Coelophysis.
- Order Thecodontia, Kheper. Discussion of the relationship between the thecodonts (a subdivision of reptiles that has fallen out of favor) and archosaurs, as well as descriptions and images of the main suborders, Proterosuchia, Parasuchia, Rauisuchia, Aetosauria, Dromaoesuchia, and Ornithosuchia. The Ornithosuchia, are the ancestors of dinosaurs.
- Archosauromorpha, Palaeos. Offers abbreviated cladogram and technical descriptions and images of this important group of reptiles, the predecessors of dinosaurs, pterosaurs, and crocodiles.
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