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Nature Geoscience
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Stepwise transition from the Eocene greenhouse to the Oligocene icehouse

Nature Geosciencevolume 1, pages329–334 (2008)Cite this article

Abstract

In the largest global cooling event of the Cenozoic Era, between 33.8 and 33.5 Myr ago, warm, high-CO2 conditions gave way to the variable ‘icehouse’ climates that prevail today. Despite intense study, the history of cooling versus ice-sheet growth and sea-level fall reconstructed from oxygen isotope values in marine sediments at the transition has not been resolved. Here, we analyse oxygen isotopes and Mg/Ca ratios of benthic foraminifera, and integrate the results with the stratigraphic record of sea-level change across the Eocene–Oligocene transition from a continental-shelf site at Saint Stephens Quarry, Alabama. Comparisons with deep-sea (Sites 522 (South Atlantic) and 1218 (Pacific))δ18O and Mg/Ca records enable us to reconstruct temperature, ice-volume and sea-level changes across the climate transition. Our records show that the transition occurred in at least three distinct steps, with an increasing influence of ice volume on the oxygen isotope record as the transition progressed. By the early Oligocene, ice sheets were∼25% larger than present. This growth was associated with a relative sea-level decrease of approximately 105 m, which equates to a 67 m eustatic fall.

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Figure 1: SSQ proxy data for ice volume, temperature and sea level.
Figure 2: Comparisons ofδ18Obf from Site 522 (ref. 7), Site 1218 (ref. 8) and SSQ (seeSupplementary Information, Table S2).
Figure 3: Comparisons ofδw from Site 522, Site 1218, and SSQ with sea level.

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Acknowledgements

This research was supported by NSF grants OCE 06-23256 (M.E.K., K.G.M., B.S.W., J.D.W.), EAR03-07112 (K.G.M.) and EAR05-06720 (K.G.M.).

Author information

Authors and Affiliations

  1. Department of Earth and Environmental Science, Rensselaer Polytechnic Inst., Troy, New York 12180, USA

    Miriam E. Katz

  2. Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, USA

    Miriam E. Katz, Kenneth G. Miller, James D. Wright, James V. Browning & Yair Rosenthal

  3. Institute of Marine and Coastal Science, Rutgers University, 71 Dudley Road, New Brunswick, New Jersey 08901, USA

    Bridget S. Wade & Yair Rosenthal

  4. Department of Geology and Geophysics, Texas A&M University, College Station, Texas 77840, USA

    Bridget S. Wade

  5. Department of Geological Sciences, 1272 University of Oregon, Eugene, Oregon 97403-1272, USA

    Benjamin S. Cramer

Authors
  1. Miriam E. Katz
  2. Kenneth G. Miller
  3. James D. Wright
  4. Bridget S. Wade
  5. James V. Browning
  6. Benjamin S. Cramer
  7. Yair Rosenthal

Corresponding author

Correspondence toMiriam E. Katz.

Supplementary information

Supplementary Information

Supplementary figures S1 and tables S1-S2 (PDF 172 kb)

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Katz, M., Miller, K., Wright, J.et al. Stepwise transition from the Eocene greenhouse to the Oligocene icehouse.Nature Geosci1, 329–334 (2008). https://doi.org/10.1038/ngeo179

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