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The top documents tagged [archeantype crustal]
Chapter 8 Precambrian Earth and Life History— Hadean and Archean The Precambrian lasted for 4 b.y., 88% of estimated geologic time. No rocks are known
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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
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