You are not currently logged in.
Access JSTOR through your library or other institution:
Periodic Extinction of Families and Genera
David M. Raup and J. John Sepkoski
New Series, Vol. 231, No. 4740 (Feb. 21, 1986), pp. 833-836
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/1696675
Page Count: 4
You can always find the topics here!Topics: Mass extinction events, Periodicity, Goodness of fit, Time series, Geology, Genera, Simulations, Geologic time scale, Randomness, Frequency ranges
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
Preview not available
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).
Science © 1986 American Association for the Advancement of Science