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Science 28 January 1966:
Vol. 151. no. 3709, pp. 448 - 450
DOI: 10.1126/science.151.3709.448
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Articles

Atlantic Deep-Sea Stratigraphy: Extension of Absolute Chronology to 320,000 Years

Teh-Lung Ku 1 and Wallace S. Broecker 1

1 Geology Department and Lamont Geological Observatory, Columbia University, Palisades, New York

Thorium-230 measurements on a core of globigerina ooze from the Caribbean Sea substantiate the prediction of Ericson et al. that the paleontological boundary U-V (Sangamon-Illinoian boundary in their scheme) in the Atlantic sediments has an age of close to 320,000 years. As the ages derived by Ericson et al. were based on extrapolations of mean sedimentation rates established by carbon-14 and protactinium-231 dating of the upper sections of this and other cores, this result confirms the assumption that sedimentation rates in the Caribbean Sea have not changed significantly during the past several hundred thousand years. The uranium content of the ocean as indicated by the deposition rate of thorium-230 was no more than 30 percent higher during glacial than during interglacial periods.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Variations in the Earth's Orbit: Pacemaker of the Ice Ages.
J. D. Hays, J. D. Hays, J. Imbrie, and N. J. Shackleton (1976)
Science 194, 1121-1132
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Caribbean Cores P6304-8 and P6304-9: New Analysis of Absolute Chronology. A Reply.
C. Emiliani, C. Emiliani, and E. Rona (1969)
Science 166, 1551-1552
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Caribbean Cores P6304-8 and P6304-9: New Analysis of Absolute Chronology.
W. S. Broecker, W. S. Broecker, and T. L. Ku (1969)
Science 166, 404-406
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Absolute Dating of Caribbean Cores P6304-8 and P6304-9.
E. Rona, E. Rona, and C. Emiliani (1969)
Science 163, 66-68
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