Earth's History

Earth's History - Earth's History Geologic Time Divided...

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Earth’s History
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    Geologic Time Divided into Eras Eras divided into periods Periods divided into Epochs
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Geologic Time Scale
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Azoic, Archeozoic & Azoic, Archeozoic & Proterozoic Eras Proterozoic Eras 80% of geologic time 80% of geologic time First 4 billion years of earth’s existence First 4 billion years of earth’s existence Gases & dust became liquid, cooling to Gases & dust became liquid, cooling to form planet form planet
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Bacteria, algae Bacteria, algae Worms, sponges, jellyfishes Worms, sponges, jellyfishes Oldest known fossils – prokaryotic cells Oldest known fossils – prokaryotic cells
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Proterozoic Era
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Representative Life
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Paleozoic Era Paleo – ‘ancient’ Zoic - animal
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    Paleozoic Era 550 – 240 MYA Plants appeared
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Earth's History - Earth's History Geologic Time Divided...

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