2021 50p Dinosaur Plesiosaurus Silver Proof Coin

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Plesiosaurs first appeared in the latest Triassic Period, possibly in the Rhaetian stage, about 203 million years 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 65 million years ago. They had a worldwide oceanic distribution.

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