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Magnetic reversals and mass extinctions


Previous analyses of the time distribution of reversals of the Earth's magnetic field have yielded mixed results. Some authors have claimed significant periodicities of order 107 yr1,2 whereas others have reported failure to reject null hypotheses of random spacing at that scale3–6. Because of repeated suggestions that field reversal is linked to biological extinction7–12, further analysis of the magnetic time series is appropriate. I present here the results of a study of the reversal record of the past 165 Myr. A stationary periodicity of 30 Myr emerges (superimposed on the non-stationarities already established by others5), which predicts pulses of increased reversal activity centred at 10, 40, 70,… Myr BP.

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Raup, D. Magnetic reversals and mass extinctions. Nature 314, 341–343 (1985).

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