periods |
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navigate by keyword : amhibians animals bacteria basilosaurus biology biosphere cambrian carnivores cartoon caveman cell cenozoic chain chronology collection dinosaur diversity education eon era evolution extinction food forms geochronology geology herbivores history insects life mammals man mesozoic molluscs omnivores ordovician organism paleozoic plesiosaurus population predator reptiles scale science set time tree vector vertebra |
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Illustration of geological time scale - periods |
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