Periodic Extinction of Families and Genera

Details Periodic Extinction of Families and Genera Periodic Extinction of Families and Genera

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...231..833r&link_type=abstract

Science, Volume 231, Issue 4740, pp. 833-836

Mathematics

Logic

100

Scientific paper

Eight major episodes of biological extinction of marine families over the past 250 million years stand significantly above local background (P < 0.05). These events are more pronounced when analyzed at the level of genus, and generic data exhibit additional apparent extinction events in the Aptian (Cretaceous) and Pliocene (Tertiary) Stages. Time-series analysis of these records strongly suggests a 26-million-year periodicity. This conclusion is robust even when adjusted for simultaneous testing of many trial periods. When the time series is limited to the four best-dated events (Cenomanian, Maestrichtian, upper Eocene, and middle Miocene), the hypothesis of randomness is also rejected for the 26-million-year period (P < 0.0002).

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