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The top documents tagged [preserved rocks]
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Precambrian Era By Erich Hartman. When It Occurred The Precambrian Era occurred from 4.6 billion years ago to 544 million years ago. It was the first
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Precambrian Geology. Comprises 88% of geologic time Precambrian has 2 Eons Geology hard to Study... Preserved rocks are metamorphosed Very few
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