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

Linda C. Ivany (), William P. Patterson and Kyger C. Lohmann
Additional contact information
Linda C. Ivany: Department of Geological Sciences University of Michigan
William P. Patterson: Syracuse University
Kyger C. Lohmann: Department of Geological Sciences University of Michigan

Nature, 2000, vol. 407, issue 6806, 887-890

Abstract: Abstract The Eocene/Oligocene boundary, at about 33.7 Myr ago, marks one of the largest extinctions of marine invertebrates in the Cenozoic period1. For example, turnover of mollusc species in the US Gulf coastal plain was over 90% at this time2,3. 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 event4, but climate reconstructions have not provided support for this hypothesis. Here we report stable oxygen isotope measurements of aragonite in fish otoliths—ear stones—collected across the Eocene/Oligocene boundary. Palaeotemperatures reconstructed from mean otolith oxygen isotope values show little change through this interval, in agreement with previous studies5,6. From incremental microsampling of otoliths, however, we can resolve the seasonal variation in temperature, recorded as the otoliths continue to accrete new material over the life of the fish. These seasonal data suggest that winters became about 4 °C colder across the Eocene/Oligocene boundary. We suggest that temperature variability, rather than change in mean annual temperature, helped to cause faunal turnover during this transition.

Date: 2000
References: Add references at CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.nature.com/articles/35038044 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:407:y:2000:i:6806:d:10.1038_35038044

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/35038044

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().