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Precambrian - PRECAMBRIAN 4.6 GA 540 MA Hadean Archean...

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PRECAMBRIAN 4.6 GA - 540 MA Hadean Archean Proterozoic
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PRECAMBRIAN Tim e Dat es Tec t onic s 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
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HADEAN Bombardment by Meteorites Outgassing forms atmosphere – water, ammonia, methane – no Oxygen Oceans from precipitation Preliminary stratification of Earth and Crust
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ARCHEAN Rock Units Granulite-Granite belts Greenstone belts Banded Iron Formation (BIF) Supracrustals Teconics/atmosphere Small, fast Protocontinents Oxygen-free atmosphere
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Location of old rocks
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BANDED IRON FORMATION
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GREENSTONE BELTS
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