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Theories and discoveries
Earth history before the dinosaurs
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Africa ammonites amphibians Antrodemus appeared areas became extinct bipedal birds body bones bony brachiopods Cambrian Carboniferous carnivores carnosaurs ceratopsians cheek teeth climate continent corals Cretaceous to Recent crocodiles crocodilians deposits Devonian dinosaurs duckbill early Cretaceous earth eggs Eocene Europe evidence evolution evolved fauna feet fishes flying lizards forms fossil geological geosyncline giant hadrosaurs head herbivorous hind horn ichthyosaurs Iguanodon instance jaws Jurassic and Cretaceous known land animals late Cretaceous late Jurassic later legs length living Lower Cretaceous mammals marine Mesozoic million modern mosasaurs mountain neck Neogene North America ORDER Ordovician ornithischians ornithopods orogeny Palaeogene Palaeozoic perhaps period Permian Pleistocene plesiosaurs present-day primitive probably pterosaurs reptiles resembling rocks sauropods sediments sharks shell Silurian skeleton skull South specialised species stegosaurs strata Subclass Suborder survived tail fin Tertiary Tethys thecodonts Trias Triassic Triceratops trilobites turtles Upper Cretaceous Upper Jurassic valve vertebrates whales