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A major revision of the geological timescale was published in 2012. Were-examine our past finding of a 27 Myr periodicity in marine extinction ratesby re-assigning dates to the extinction data used previously. We find that thespectral power at this period is somewhat increased, and persists at a narrowbandwidth, which supports our previous contention that the Nemesis hypothesisis untenable as an explanation for the periodicity that was first noted by Raupand Sepkoski in the 1980s. We enumerate a number of problems in a recent studycomparing extinction rates with time series models.

Do Periodicities in Extinction -- with Possible Astronomical Connections -- Survive a Revision of the Geological Timescale?