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Science 2 July 1965:
Vol. 149. no. 3679, pp. 58 - 60
DOI: 10.1126/science.149.3679.58
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Articles

Uranium-Series Dating of Corals and Oolites from Bahaman and Florida Key Limestones

Wallace S. Broecker 1 and David L. Thurber 1

1 Lamont Geological Observatory, Columbia University, Palisades, New York

Samples of fossil coral and oolite from marine formations of the Bahamas and the Florida Keys have been analyzed for their concentrations of uranium and thorium isotopes. Ages calculated from the ratio Th230: U234 clearly indicate periods of marine limestone formation at about 85,000, 130,000, and 190,000 years ago, implying that the surface of the ocean was then close to its present level.


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