A 27.5-My underlying periodicity detected in extinction episodes of non-marine tetrapods

@article{Rampino2020A2U,
  title={A 27.5-My underlying periodicity detected in extinction episodes of non-marine tetrapods},
  author={Michael R. Rampino and Ken Caldeira and Yuhong Zhu},
  journal={Historical Biology},
  year={2020},
  volume={33},
  pages={3084 - 3090}
}
ABSTRACT Non-marine tetrapods (amphibians, reptiles, birds and mammals) have apparently experienced at least 10 distinct episodes of intensified extinctions over the past 300 My. Eight of these ten non-marine extinction events are concurrent with known marine-extinction episodes, which previously yielded evidence for an underlying period of ~26.4 to 27.3 My. We performed circular spectral analysis and Fourier transform analysis of the ages of the ten recognised tetrapod-extinction events, and… 
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