Cooler winters as a possible cause of mass extinctions at the Eocene/Oligocene boundary

@article{Ivany2000CoolerWA,
  title={Cooler winters as a possible cause of mass extinctions at the Eocene/Oligocene boundary},
  author={Linda C. Ivany and William P. Patterson and Kyger C. Lohmann},
  journal={Nature},
  year={2000},
  volume={407},
  pages={887-890}
}
The Eocene/Oligocene boundary, at about 33.7 Myr ago, marks one of the largest extinctions of marine invertebrates in the Cenozoic period. For example, turnover of mollusc species in the US Gulf coastal plain was over 90% at this time. A temperature change across this boundary—from warm Eocene climates to cooler conditions in the Oligocene—has been suggested as a cause of this extinction event, but climate reconstructions have not provided support for this hypothesis. Here we report stable… 
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