Why Did Trilobites Go Extinct

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Why did trilobites go extinct? | Live Science

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Trilobite fossil gallery: facts and information about trilobites

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LiveScience: Cretaceous cold case of 'dueling' T. rex and Triceratops

Trilobite geological time scale

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Trilobite Fossil Gallery: Facts and Information about Trilobites

Trilobite lesson for kids: facts & fossils

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