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The top documents tagged [mya trilobites]
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mya trilobites
The five largest mass extinctions in Earth's history occurred during:five largest mass extinctions 1.The late Ordovician period (about 438 million years.
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Geologic Time- A method of looking back at earth’s history based on the information preserved in the fossils and other rock structures of the rock record.
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Life and Geologic Time Sci 4.1 Geologic time scale: history of earth most units based on types of living things.
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