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PPT-Historical Geology This period is about 5 times as long as the Paleozoic and Mesozoic PowerPoint Presentation

3 billion years ago b ya The oldest rock is dated at 38 bya The Earth is thought to be 46 bya Periods within the Precambrian PROTEROZOIC ARCHEAN Era

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Historical Geology This period is about 5 times as long as the Paleozoic and Mesozoic: Transcript

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