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Earth Science: The Mesozoic Era
Transcript of Earth Science: The Mesozoic Era
The Triassic Period The triassic period extends from about 250 to 200 million years ago.Throughout the triassic period pangaea remained as one. Slowly due to the permian extinction many reptiles evolved and later the first mammals appeared. The The Triassic Period The Triassic Period extends from about 250 to 200 million years ago. Throughout most of the Triassic Period Pangaea remained as one.The Permian Extinction marked the beginning of this period. Slowly, due to the Permian Extinction many reptiles evolved and later the first mammals appeared. The end of this period was marked by another extinction event whose cause is uncertain. Volcano eruptions and meteor strikes are disputed causes. JURASSIC PERIOD Pangaea continued to split apart. Many kinds of dinosaurs evolved and became widely distributed. JURASSIC EARTH As rifts formed between Pangaea, seas between continents. Mountain building also occurred in the west of North America. The North American plate moved west over an oceanic plate. Tectonic activity started a wave of deformation in land. Newly formed Jurassic seas helped moderate the climate of Pangaea. Climates were mild at all latitudes, and the warmer conditions contributed to new life forms. JURASSIC LIFE New developments occurred in the ocean, on land, and in the air. In the ocean, fish with moderate characteristics evolved. Their jaw structure, scales, skeletons, and fins are similar to the ones today. The reptiles adapted to the ocean. Dinosaurs developed into varied and widespread groups. EVOLUTION OF BIRDS The evolution of birds started with flying reptiles that had "wings" formed with the membrane of skin attached to their forelegs. Scientist think birds were evolved from dinosaurs, some dinosaurs had feathers. The early ancestors of birds were probably small, feathered dinosaurs that could fly. These dinosaurs lacked a large breastbone of modern birds to anchor flight muscles. They could probably only fly short distances. Plesiosaur Ichthyosaur Stegosaurus Allosaurus Diplodocus Pterodactyl Archaeopteryx The Triassic Period: Earth During this period , Pangaea was surrounded by Panthalassa(meaning "all sea").Climate on Pangaea was hot in the summers and cold in the winters, similar to the interior of North America and Asia today. The Triassic Period is also known to scientists as the "coal gap" because most peat-producing plants died out in the Permian Extinction. Towards the end of the Triassic Period, Gondwana began to move south and Laurasia north. The Triassic Period: Life Many organisms evolved during the Triassic Period.The first dinosaurs were among many reptiles that evolved. Many mammal-like reptiles evolved into the first mammals in this period. Mammals are warmblooded animals that nourish their young with milk. The Megazostrodon, small and rodent-like, are an example.Also, Gymnosperms, a group of plants with seeds that lack an outer protective coat, became common. Gymnosperms were so abundant because they could survive and reproduce in the Triassic Pangaea desert-like climate. Conifers, Cycads, and Ginkgoes are gymnosperms. Megazostrodon Tasmanian Ginkgoe Cretaceous Period The Cretaceous Period ended with a mass extinction that killed all dinosaurs and many other things. The Cretaceous was the time of the fierce Tyrannosaurus rex, horned Triceratops, and the gigantic plant eaters like Apatosaurus. Many modern angiosperms- including trees such as willow, birch, and sassafras-involved and became common during the cretaceous period. The Cretaceous Extinction About 65 million years ago, the Creatceous period ended in a mass extinction. The dinosaurs and most other large animals become extinct. Smaller reptiles,birds,and mammals were also affected. Thank you