Precambrian - PRECAMBRIAN 4.6 GA 540 MA • Hadean • Archean • Proterozoic PRECAMBRIAN Time Dat es Tect onics Life 540 Edicaran Fossils 600

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Unformatted text preview: PRECAMBRIAN 4.6 GA - 540 MA • Hadean • Archean • Proterozoic PRECAMBRIAN Time Dat es Tect onics Life 540 Edicaran Fossils 600 Breakup of Rodinia Major Extinction Glaciation Multicelled Animals Supercontinent Rodinia Worms, Proctocists 900 Grenville Orogeny Mid-US Rift Acritarchs 1600 Oldest Red Beds Oldest Ophiolite 1 st Eukaryotes TransHudsonian Orogeny BIFs, Glaciation Stromatolites widespread 2500 Canadian Greenstones Single-cell Prokaryotes Kenoran Orogeny 2900 Continents build up Definite Stromatolites 3400 1 st Stromatolites? Oldest Greenstones First continents 1 st Life Oldest Rocks 4000 Oldest Zircons 4600 Earth Forms PROTEROZOIC ARCHEAN HADEAN Late Late Middle Middle Early Early HADEAN • Bombardment by Meteorites • Outgassing forms atmosphere – water, ammonia, methane – no Oxygen • Oceans from precipitation • Preliminary stratification of Earth and Crust ARCHEAN Rock Units • Granulite-Granite belts • Greenstone belts • Banded Iron Formation (BIF) • Supracrustals Teconics/atmosphere • Small, fast Protocontinents • Oxygen-free atmosphere Location of old rocks...
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This note was uploaded on 11/06/2010 for the course PLANET EAR 460:103 taught by Professor Alexandergates during the Fall '10 term at Rutgers.

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Precambrian - PRECAMBRIAN 4.6 GA 540 MA • Hadean • Archean • Proterozoic PRECAMBRIAN Time Dat es Tect onics Life 540 Edicaran Fossils 600

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