The magnetic reversal record is not periodic

@article{Lutz1985TheMR,
  title={The magnetic reversal record is not periodic},
  author={Timothy M. Lutz},
  journal={Nature},
  year={1985},
  volume={317},
  pages={404-407}
}
  • T. Lutz
  • Published 1 October 1985
  • Biology
  • Nature
Statistical analysis of one version of the magnetic reversal record suggests that the frequency of reversals has changed cyclically with a period of 30 Myr starting at least 165 Myr ago. But factors other than periodicity affect the analysis used and here I show that there is no compelling evidence for periodicity in the reversal record. The results of essentially identical analyses that have been applied to other geolocial data should also be re-evaluated. 

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Several studies have suggested a period of about 30 Myr in the frequency of geomagnetic reversal1–4 superposed on a long-term variation, but none of these studies explicitly investigated the effects

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    Proceedings of the National Academy of Sciences of the United States of America
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