- Kenneth J. Hsü
Published Online: 15 MAR 2013
Copyright 1986 by the American Geophysical Union.
Mesozoic and Cenozoic Oceans
How to Cite
Corliss, B. H. and Keigwin, L. D. (1986) Eocene-Oligocene Paleoceanography, in Mesozoic and Cenozoic Oceans (ed K. J. Hsü), American Geophysical Union, Washington, D. C.. doi: 10.1029/GD015p0101
- Published Online: 15 MAR 2013
- Published Print: 1 JAN 1986
Print ISBN: 9780875905150
Online ISBN: 9781118669914
- Geology, Stratigraphic—Mesozoic—Congresses;
- Geology, Stratigraphic—Cenozoic—Congresses;
- Ocean circulation—Congresses
Recent studies of Eocene-Oligocene paleoceanography based on the analysis of deep-sea microfossils are reviewed. Distinct changes in foraminiferal stable isotope compositions and biotic patterns occurred in the ocean near the Eocene/Oligocene boundary, but the data do not suggest a catastrophic extinction event took place at this time. The geological events can best be explained in terms of changing paleoceanographic and paleoclimatic conditions and do not support a bolide impact event having a major influence on the earth's biosphere near the boundary. The lack of a mass extinction of marine microfossils at the Eocene/Oligocene boundary argues against the existence of 26 m.y. cyclicity of extinctions in the Cenozoic.