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Science 13 April 2001:
Vol. 292. no. 5515, p. 191
DOI: 10.1126/science.292.5515.191
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News of the Week

PALEOCLIMATOLOGY:
An Orbital Confluence Leaves Its Mark

Richard A. Kerr

On page 274 of this issue, paleoceanographers report that 23 million years ago a rare combination of the shape of Earth's orbit and the tilt of its rotation axis led to a brief climatic cooling and buildup of ice on Antarctica. This, in turn, lowered sea level and exposed the shallow sea floor to erosion, creating the Oligocene-Miocene boundary. The convergence of orbital variations provides further support for the power of orbital variations to influence climate.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)