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Geologic Time First Fossils More Recent
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Africa Allosaurus amphibians animals Apatosaurus approximately archosaurs asteroid atmosphere Brachiosaurus carnivorous carnivorous dinosaurs Cast claws climate comets continents courtesy of University crater creatures Cretaceous period Deinonychus dinosaur bones dinosaur fossils dinosaur skeletons discovered discovery dromaeosaurids Earth eventually evolution evolved excavated feet footprints fossil bones fossil finds fossil remains geologic time scale giant Giganotosaurus Gondwanaland hadrosaurs herbivorous herbivorous dinosaurs huge Ice Age ichthyosaurs Iguanodon impact crater insects Jurassic period kilometers known land largest dinosaur late Cretaceous late Triassic Laurasia layer legs lived Lizard major mammals Mesozoic meters Michigan Exhibit Museum million years ago Museum of Natural Natural History North America oceans organisms paleontologists Pangea period dinosaurs Photo courtesy plants predators prehistoric prey probably pterosaurs quarry reptiles rock sauropods Science scientists believe similar skull solar system South Stegosaurus teeth temperature theory theropods trackways Triassic period Triceratops Tyrannosaurus rex Velociraptor