BIOLOGY 1M03 Lecture Notes - Electron Paramagnetic Resonance, Radiometric Dating, Continental Drift

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During permian and early triassic periods, much of the world"s fauna was dominated by therapsids, a diverse group of reptiles. At end of triassic, most therapsid groups disappeared, and dinosaurs radiated most lands. At end of mesozoic, placental and marsupial mammals dominated. Modern humans have many complex adaptations, like grasping hands, bipedal locomotion (walking upright on two legs), toolmaking, language, and cooperation. About 200 mya, all the land that exists today was once a giant landmass called pangaea. About 125 mya, pangaea broke off into a northern half, called laurasia (north america and eurasia minus india), and a southern half, called gondwanaland. Much of our knowledge of history of life comes from study of fossils, the mineralized bones of dead organisms. 1 radiometric methods provide one of the most important ways to date fossils: potassium-argon dating. Used to date age of volcanic rocks found in association with fossil material. Molten rock emerges from volcano at high temperatures.

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