Permian-Triassic extinction event, illustration
Conceptual illustration of The Permian??riassic extinction event, also known as the P?? extinction, the End-Permian Extinction and the Great Dying. It formed the boundary between the Permian and Triassic geologic periods, as well as between the Paleozoic and Mesozoic eras, approximately 252 million years ago., by RICHARD JONES/SCIENCE PHOTO LIBRARY
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