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Download Earth History and The Fossil Record
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Earth History and The Fossil Record https://www.youtube.com/watch?v=ZSt9tm3 RoUU Aim: What were the major geologic developments during Earth’s history? • Do Now: Does anyone know how old the Earth really is? How do you think we know? Precambrian Earth • Earth formed about 4.56 billion years ago • During this time • The atmosphere and oceans formed • Plate tectonics began to build landmasses Earth Formation • Gravity pulls together dust, rock, and ice from space • High-velocity rocks from space cause the planet to melt Earth Formation (cont.) • Dense materials (Iron/Nickel) sink to the center forming the core Earth Formation (cont.) • Less dense materials (silicates) “floated” forming earth’s mantle and crust Atmosphere Formation • Earth’s early atmosphere consisted of: • Water vapor • Carbon dioxide • Nitrogen • Several trace gases • NO OXYGEN Ocean Formation • Water vapor in the air starts to cool and condense • Condensed water vapor turns to liquid and forms the early oceans Earth’s Time Scale • ESRT Page 8 AND 9 • Earth’s time has been broken up into SPECIFIC time units Earth’s Time Scale (USE YOUR ESRT!) Largest Length of Time Time Scale EONS ERAS PERIODS Smallest Length of Time EPOCHS EONS • Phanerozoic • Pre-Cambrian • Archean • Proterozoic ERAS • Cenozoic • Mesozoic • Paleozoic PERIODS • PALEOZOIC ERA • Broken into: • Permian • Carboniferous • Devonian • Silurian • Ordovician • Cambrian PERIODS • MESOZOIC • Broken into: • Triassic • Jurassic • Cretaceous PERIODS • CENOZOIC • Broken into: • Quaternary • Neogene • Paleogene EPOCHS • Smallest Time Scale • Broken into: • Early/Middle/Late • Or the “CENES” • • • • • • • Holocene Pleistocene Pliocene Miocene Oligocene Eocene Paleocene Radioactive Dating
