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Science 11 July 1997:
Vol. 277. no. 5323, pp. 215 - 218
DOI: 10.1126/science.277.5323.215
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Reports

Glacial Cycles and Astronomical Forcing

Richard A. Muller, Gordon J. MacDonald

Narrow spectral features in ocean sediment records offer strong evidence that the cycles of glaciation were driven by astronomical forces. Two million years ago, the cycles match the 41,000-year period of Earth's obliquity. This supports the Croll/Milankovitch theory, which attributes the cycles to variations in insolation. But for the past million years, the spectrum is dominated by a single 100,000-year feature and is a poor match to the predictions of insolation models. The spectrum can be accounted for by a theory that derives the cycles of glaciation from variations in the inclination of Earth's orbital plane.

R. A. Muller, Department of Physics and Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720, USA.
G. J. MacDonald, International Institute for Applied Systems Analysis, A-2361 Laxenburg, Austria.

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