Plesiosauria

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Plesiosaurs first appeared in the latest Triassic Period, possibly in the Rhaetian stage, about 205 million year ago. They became especially common during the Jurassic Period, thriving until their disappearance due to the Cretaceous–Paleogene extinction event at the end of the Cretaceous Period, about 66 million years ago. They had a worldwide oceanic distribution.

For more information, visit the Wikipedia entry.

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