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Early+Paleozoic+Era[1]

Early+Paleozoic+Era[1] - The Early Paleozoic World...

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Unformatted text preview: The Early Paleozoic World Phanerozoic Eon • Paleozoic Era 542 Ma – 251 Ma – “Ancient Life” – Cambrian Period 542 Ma- 488 Ma – Ordovician Period 488 Ma – 444 Ma • Mesozoic Era 251Ma – 65.5 Ma – “Middle Life” • Cenozoic Era 65.5 – present – “Recent Life” 444 Million years 488 Million years 542 Million years Cambrian and Ordovician Periods of the Paleozoic Era Ohio and the Paleozoic • Ohio Geologic Cross Section Map Paleozoic sea Cambrian Explosion • Lowermost Cambrian – Simple skeletal fossils – Teeth Cambrian Explosion • Large animals with skeletons – Trilobites – Arthropods with calcified segmented skeletons Cambrian Explosion • Bottom-dwelling forms create scratch marks – Similar to some Neoproterozoic tracks Cambrian Explosion • Other abundant Early Cambrian animal groups – mollusks – brachiopods – Echinoderms Cambrian Explosion • Chengjiang fauna – Soft- bodied creatures including: • Cnidarians • Predatory worms • Anomalocarids – Huge carnivores (2 m) – Swimmers – Impaled prey Cambrian Explosion...
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Early+Paleozoic+Era[1] - The Early Paleozoic World...

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