Jurassic Period—Age of Dinosaurs

Jun 30th, 2015
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• 145-200 million years ago • Triassic—Jurassic Extinction o Cleared evolutionary space that the dinosaurs filled o Why did they fill this space so easily? Babies grew quickly. Reproduction occurred in adolescence

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Jurassic PeriodAge of Dinosaurs145-200 million years agoTriassicJurassic ExtinctionCleared evolutionary space that the dinosaurs filledWhy did they fill this space so easily?Babies grew quicklyReproduction occurred in adolescenceJurassic PeriodPangea continuing to splitRifting acceleratedLaurasia split into North America and EurasiaGondwana began to splitEastern half: Antarctica, Madagascar, India, & AustraliaWestern half: Africa & South AmericaJurassic LandformsNew oceans filled in spaces betweenMore shallow water environmentsabundant & diverse lifePhytoplankton: coccoliths, foramsReef-building organisms: corals, spongesSeparation of landformschanges in diversity: evolutionIsolation of populationsRifting in ocean basins & mountain building on continentsMountain buildinghigher sea levelMore ocean circulationmore moisture on the continentsHumid, subtropical climatesMore moisturemore plantsmore food!Monsoon seasons created wide river basinsFlash floodsStill vast dune fields near the equatorJurassic OceansAmmonitesCarnivorous: ate crabs, other crustaceans, jellyfishDifferent speciesanywhere from 1in to 8ft in diameter. Widespread and found worldwideFemales were up to 400% biggerLeedsichthysUp to 88ft long Around the size of a blue whalelargest fish of all timeNo way to defend itselfattacked by things like marine crocodilians40,000 teeth (WOAH)Filter feeder?Metriorhynchus~10ft longMarine crocodilianVe

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