A Shocking View of the Permo-Triassic

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Science  15 Nov 1996:
Vol. 274, Issue 5290, pp. 1080
DOI: 10.1126/science.274.5290.1080

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Denver—The biggest extinction of all time was 250 million years ago at the end of the Permian period, and has been considered a long, drawn-out “event.” Now grains of quartz from this time may show the telltale shock fractures that indicate an asteroid impact—and an almost instantaneous extinction.