Geologic Time Scale - Texas A&M International University · Geologic Time Scale 1. First Fossils ~ 3.5 Ga Archean Algae (??) 2. Modern Stromatolites at Shark Bay, Western Australia

Geologic Time Scale

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First Fossils ~ 3.5 Ga Archean Algae (??)

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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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