Periodicity in extinction and the problem of catastrophism in the history of life

  title={Periodicity in extinction and the problem of catastrophism in the history of life},
  author={J John . Sepkoski},
  journal={Journal of the Geological Society},
  pages={19 - 7}
  • J. Sepkoski
  • Published 1 January 1989
  • Environmental Science, Geography
  • Journal of the Geological Society
The hypothesis that extinction events have recurred periodically over the last quarter billion years is greatly strengthened by new data on the stratigraphic ranges of marine animal genera. In the interval from the Permian to Recent, these data encompass some 13,000 generic extinctions, providing a more sensitive indicator of species-level extinctions than previously used familial data. Extinction time series computed from the generic data display nine strong peaks that are nearly uniformly… 

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