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The top documents tagged [long episode of earth]
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The Proterozoic Eon CHAPTER 7. Proterozoic- Last chapter of Precambrian time The Proterozoic boundary is placed @ 2.5 By, mostly arbitrarily Essentially
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Proterozoic sedimentary rocks –in Glacier National Park, Montana The angular peaks, ridges and broad valleys –were carved by Pleistocene and Recent glaciers
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Chapter 9 Precambrian Earth History— The Proterozoic Eon
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Chapter 9
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Chapter 9
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