Analysis of two independent data sets with increased taxonomic resolution (genera rather than families) using the revised 2012 timescale reveals that an extinction periodicity first detected by Raup and Sepkoski (1984) for ...

A major revision of the geological timescale was published in 2012. We re-examine our past finding of a 27 Myr periodicity in marine extinction rates by re-assigning dates to the extinction data used previously. We find ...

We find that the marine Sr-87/Sr-86 record shows a significant periodicity of 59.3 +/- 3 m.yr. The Sr-87/Sr-86 record is 171 degrees +/- 12 degrees out of phase with a 62 (+/- 3)-m.yr. periodicity previously reported in ...

We use Fourier analysis to investigate evolutionary dynamics related to periodicities in marine fossil biodiversity. Coherent periodic fluctuation in both origination and extinction of "short-lived" genera (those ...