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Science 8 November 2002:
Vol. 298. no. 5596, pp. 1165 - 1166
DOI: 10.1126/science.298.5596.1165
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News Focus

PALEOCEANOGRAPHY:
Inconstant Ancient Seas and Life's Path

Richard A. Kerr

Seawater composition has changed over geological time, geochemists now realize. Has biological evolution changed along with it? A paper in this issue of Science (p. 1222) suggests that oscillations in the chemical composition of the world ocean, likely driven by the varying tempo of plate tectonics, might have helped trigger a number of important evolutionary events.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Echinoderm Skeletal Preservation: Calcite-Aragonite Seas and the Mg/Ca Ratio of Phanerozoic Oceans.
(2004)
Journal of Sedimentary Research 74, 355-365
The geometry and petrogenesis of dolomite hydrocarbon reservoirs: introduction.
C. J. R. Braithwaite, G. Rizzi, and G. Darke (2004)
Geological Society, London, Special Publications 235, 1-6
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Science. ISSN 0036-8075 (print), 1095-9203 (online)