Geological rhythms and cometary impacts

Michael R. Rampino, Richard B. Stothers

Research output: Contribution to journalArticlepeer-review


Time-series analysis reveals two dominant, stable long-term periodicities approximately equal to 33 ± 3 and 260 ± 25 million years in the known series of geological and biological upheavals during the Phanerozoic Eon. Because the cycles of these episodes agree in period and phase with the cycles of impact cratering on Earth, these results suggest that periodic comet impacts strongly influence global tectonism and biological evolution. These two periodicities could arise from interactions of the solar system with interstellar clouds as the solar system moves cyclically through the Galaxy.

Original languageEnglish (US)
Pages (from-to)1427-1431
Number of pages5
Issue number4681
StatePublished - 1984

ASJC Scopus subject areas

  • General


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