15-dinoecosystem - 460:206 DINOSAURS The Structure and...

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460:206 DINOSAURS The Structure and Evolution of the Dinosaur Ecosystem
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Dinosaur Ecosystem ENVIRONMENT DINOSAURS TIME
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Middle & Late Cretaceous Early Cretaceous Late Jurassic Early & Middle Jurassic Late Triassic TIME
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Life in the Triassic Period (250- 199 Ma) Dinos first appeared during this time. Mammals, turtles, frogs, crocodiles all appeared in early forms. Pterosaurs and Marine Reptiles appeared. The birth of the Atlantic Ocean Started off with P-T Extinction
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Mesozoic- ~250 Ma to ~65 Ma Permian- Triassic Mass Extinction ~95 % of all life went extinct Reptiles became dominant life form Massive eruption of lavas from Siberia (Siberian Lava Traps) and Emission of CO2 cause dramatic climate change. Ocean anoxia Possible impact? (possible in Australia and Antarctica Archosaurs and plants survive, land was barren right after extinction
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Triassic Geography & Climate - Pangea was formed with all continents together - Climate was very hot and dry (esp in interior of continents) - May explain why reptiles (and dinos) became dominant and not mammals.
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Gymnosperms- have cones or pollen spores Ferns, woody plants (ginkgo trees, cycads, pines, cypresses, redwoods) Vegetation Triassic - Right after extinction, land was barren of plant life, but some had to survive
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Labyrinthodonts, Thecodonts Other vertebrates Triassic- Many reptile like sprawlers and quadrupeds
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Frogs, Turtles, pterosaurs, & mammals Other vertebrates Triassic Airways Gliders and powered flight
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Frogs, Turtles & mammals Triassic
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Plesiosaurs, but more common in J and K Marine Life Triassic Tanystropheus Ichthyosaurs ~3 to 50 feet long
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Late Triassic- “New Blood” movie Primitive Saurischians Prosauropods Primitive Ornithischians Primitive Theropods Herrerasaurus & Coelophysoids Pisanosaurus- Thyreophora Dinos around, but not “Master of Land”
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End- Triassic Mass Extinction Dinosaurs became dominant life form
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