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Elementary Science Education

Geologic Ages

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      Bernard Nebel
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      Where layers of sedimentary rock occur, e.g., the Grand Canyon, it follows logically that lower layers were laid down first and, hence, are older. Thus, fossils found in successive layers show how flora and fauna of the Earth has changed over time. The results are depicted in a variety of charts. Type into your browser: Geologic ages illustrated chart images

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