Abstract
Abstract Precisely dated impact craters, major geological disturbances and mass extinction peaks were used to investigate statistically the hypothesis that global terrestrial phenomena are triggered by the Galactic environment through bombardment episodes. Strong temporal correlations were found between events in these datasets, and in aggregate they were found to have a periodicity of c. 27 ± 1 Ma corresponding to the half-period of the Sun’s vertical oscillations within the Galactic disc. Global disturbances appear to be forced in quasi-periodic fashion through a combination of impacts and prolonged climatic stress, the latter as a result of stratospheric dusting by debris from very large short-period comets.
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