Abstract

Paleomagnetic and C14 age-supported correlations of fluctuations in the frequency of the Globorotalia cultrata complex and other faunal and lithologic parameters in seven carbonate cores establish a paleoclimatic stratigraphy for the past 700 × 103 yr in the western equatorial Pacific. Oscillations in the faunal and lithologic parameters are interpreted as being due primarily to variations in surface-water productivity, which are in turn linked to waxing and waning of equatorial upwelling intensity. Apparent in the western equatorial Pacific stratigraphy are eight to nine upwelling-intensity cycles in the Brunhes normal polarity epoch.

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