Abstract
RELATIONSHIPS between the variations in the Earth's magnetism and climatic changes have been suggested1–8. Wollin et al.7 correlated long-period variations in inclination and intensity with evidence of climatic changes from deep-sea sediment cores showing a record of about the past 500,000 yr. In addition, they correlated climatic changes with variations in magnetic intensity based on measurements by Bucha et al.9 in archaeological materials from Arizona, Mexico, Europe, and Asia going back to 8,000 yr ago. Wollin, Ericson, and Ryan8 extended the correlation between long-period variations of the magnetic intensity and evidence of climatic changes from deep-sea sediment cores back to 1.2 m.y.
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