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Life in the Mesozoic The Age of Dinosaurs
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Mesozoic Life Highlights Oceans repopulated with “Modern Fauna” Dominant land animals - Dinosaurs First Flowering Plants & Social Insects First Mammals First Birds Two Mass Extinctions (end-Triassic and end-Cretaceous)
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What’s Happening in the Oceans?
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Phytoplankton Erupt
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Paleozoic vs. Mesozoic Rugosa & Tabulata Corals Hexacorals
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Reefs - Hexacorals
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Reefs - Rudists
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Paleozoic vs. Mesozoic BrachiopodsBivalves & Gastropods
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Inoceramids
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Paleozoic vs. Mesozoic CrinoidsEchinoids (Sea Urchins)
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Paleozoic vs. Mesozoic TrilobitesCrustaceans
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Life was Adapting to Major Marine Predators
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Ammanoids - Parapuzosia
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Bony Fish - Xiphactinus
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Marine Reptiles
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Placodonts
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Plesiosaurs: Elasmosaurus
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Kronosaurus
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Ichthyosaurus
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Mosasaurus Largest- 150 ft long!
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Marine Reptile Relations
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Giant Sea Turtles
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The “Green Report” Flower Power Add Color to the Earth
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Angiosperms
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First Flowers Magnolia Cretaceous Flower
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Flowers and Insects Cretaceous
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Paleozoic vs. Mesozoic Large AmphibiansFrogs and Salamanders Paracyclotosaurus
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Triassic Frogs
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Mesozoic Reptiles Synapsids (Mammals) Anapsids (Turtles) Diapsids Lizards & Snakes Crocodiles Pterosaurs Marine Reptiles Dinosaurs & Birds Archosaurs
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Archosaurs: Early Diapsids
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Big Dinosaur Questions What are Dinosaurs? How do we understand Dinosaur behavior? Where dinosaurs warm-blooded (endotherms) or cold-blooded (ectotherms)? Did birds evolve from dinosaurs? What caused the extinction of the dinosaurs?
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Dinosaurs vs. “Reptiles” 1.Upright posture Legs beneath the body rather than to the side 2.Unique arrangement of ankle hinge (and other skeletal differences)
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The 2 Major Lines of Dinosaurs
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Critters Gallery critters.pixel-shack.com Russel Gooday & John Hughes
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Ornithischia “Bird-Hipped Dinosaurs” 1.Stegosaurs 2.Hadrosaurs 3.Ankylosaurs 4.Pachycephalosaurs 5.Ceratopsids All Herbivores
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Hadrosaurs - “Duck-billed Dinosaurs” Ouranosaurus
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Hadrosaurs Parasauralophus
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Hadrosaurs Maiasaurus
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Laellynasaura
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Stegosaurs Stegosaurus
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Ankylosaurids - Natures Tanks Euoplocephalus
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Ankylosaurids ankylosaurus
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Pachycephalosaurs - “Bone Heads” Pachycephalosaurus
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Ceratopsids “Horned Dinos” Torosaurus
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Ceratopsids Triceratops
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