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… 

Non-marine tetrapod extinctions solve extinction periodicity mystery

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  • Geography
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  • 2021
ABSTRACT Based on their compiled data set of ten extinction episodes (four of which had no known extinction rates) published earlier in this journal, Rampino and co-authors claimed a 27.5-My period

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    Biogeosciences
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