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The top documents tagged [mya ordovician]
Cambrian-Ordovician Periods
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Future Evolutionary Flexibility and Biodiversity Biodiversity
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Past Climate Change and Species Responses Melissa Marquez
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Early Paleozoic. Periods of the Early Paleozoic ► Cambrian: 570-505 mya ► Ordovician: 505-438 mya ► Silurian: 438-408 mya
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