Katz, Miriam E; Miller, Kenneth G; Wright, James D; Wade, Bridget S; Browning, James V; Cramer, Benjamin S; Rosenthal, Yair (2008): Stable isotope record, Mg/Ca ratios and age model of St. Stephens Quarry, Alabama [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.769587, Supplement to: Katz, ME et al. (2008): Stepwise transition from the Eocene greenhouse to the Oligocene icehouse. Nature Geoscience, 1, 329-334, https://doi.org/10.1038/ngeo179
Always quote citation above when using data! You can download the citation in several formats below.
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)) d18O 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.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 15.073684 * Median Longitude: -75.000241 * South-bound Latitude: -26.114000 * West-bound Longitude: -135.366660 * North-bound Latitude: 31.550000 * East-bound Longitude: -5.129700
Date/Time Start: 1980-05-06T00:00:00 * Date/Time End: 2001-11-14T00:00:00
Event(s):
73-522_Site * Latitude: -26.114000 * Longitude: -5.129700 * Date/Time: 1980-05-06T00:00:00 * Elevation: -4441.0 m * Penetration: 4.751 m * Recovery: 2.614 m * Location: South Atlantic/PLATEAU * Campaign: Leg73 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 72 cores; 293.3 m cored; 5 m drilled; 89.1% recovery
199-1218 * Latitude: 8.889630 * Longitude: -135.366660 * Date/Time: 2001-11-14T00:00:00 * Elevation: -4827.2 m * Penetration: 797.1 m * Recovery: 723.7 m * Location: North Pacific Ocean * Campaign: Leg199 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 80 cores; 735.1 m cored; 62 m drilled; 98.5% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Katz, ME; Miller, KG; Wright, JD et al. (2008): (Table S1) Age models of DSDP Site 73-522, ODP Site 199-1218 and St. Stephens Quarry. https://doi.org/10.1594/PANGAEA.769577
- Katz, ME; Miller, KG; Wright, JD et al. (2008): (Table S2) Stable isotope record and Mg/Ca ratios of benthic foraminifera from the St. Stephens Quarry. https://doi.org/10.1594/PANGAEA.769586