A factor analytic description of the phanerozoic marine fossil record

@article{Sepkoski1981AFA,
  title={A factor analytic description of the phanerozoic marine fossil record},
  author={J John . Sepkoski},
  journal={Paleobiology},
  year={1981},
  volume={7},
  pages={36-53}
}
Data on numbers of marine families within 91 metazoan classes known from the Phanerozoic fossil record are analyzed. The distribution of the 2800 fossil families among the classes is very uneven, with most belonging to a small minority of classes. Similarly, the stratigraphic distribution of the classes is very uneven, with most first appearing early in the Paleozoic and with many of the smaller classes becoming extinct before the end of that era. However, despite this unevenness, a Q-mode… Expand
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