geologic time scale · geologic time scale 1. first fossils ~ 3.5 ga archean algae (??) 2. modern...
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Geologic Time Scale
1
First Fossils ~ 3.5 Ga Archean Algae (??)
2
Modern Stromatolites at Shark Bay, Western Australia
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2.7 Ga Stromatolites from Australia
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2.5 Ga. BIF - Banded Iron Formation
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The Formation of BIFs
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2.3 Ga - The Beginning of Continental Redbeds
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Paleoproterozoic Laurentia
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Mesoproterozoic Laurentia
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Neoproterozoic Laurentia
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End of the Proterozoic Eon - 541 Ma.
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1.8 Ga. Nuna or Columbia Supercontinent ???
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Supercontinent Rodinia - 750 Ma
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Supercontinent Pannotia
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A Valley (Alpine) Glacier
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Glacier forming Till
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Glacial Tillite
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Snowball Earth (900 and 600 Ma)
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1.1 Ga Midcontinental Rift of Laurentia
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Leaving the Proterozoic Eon
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