Terrestrial mass extinctions, cometary impacts and the Sun's motion perpendicular to the galactic plane


Episodes of mass extinctions on the Earth are now strongly suspected to be cyclical1. We report here that our analysis of the data of Raup and Sepkoski1 suggests that the dominant cyclicity in major marine mass extinctions during at least the past 250 Myr is 30 ± 1 Myr, with the standard deviation of an individual episode being ±9 Myr. We find this… (More)
DOI: 10.1038/308709a0


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