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The end-Triassic mass extinction event, one of the five biggest in the Phanerozoic, is clearly marked in the marine realm by the almost total extinction of the ammonites, final disappearance of the conodonts, collapse of the reef ecosystem, and substantial changes in other groups. In the terrestrial realm a contemporary mass extinction event among the tetrapods is clearly recorded in eastern North America, the site of the best stratigraphic record, and there was also a major floral turnover that has probably been hitherto underestimated. With regard to possible causes, there is no evidence in the stratigraphic sequence supporting bolide impact,...

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