The pattern of Pleistocene sedimentation and carbonate dissolution in shallow cores from the equatorial western flank of the East Pacific Rise differs from that of sediments from deeper equatorial cores. Whereas carbonate-siliceous cycles in deep-water sediments, just above the calcite compensation depth, primarily reflect glacial-interglacial differences in carbonate preservation, our results suggest that the pattern of glacial-interglacial sedimentation in shallower cores, near the lysocline, primarily reflects productivity changes in near-surface waters.

The record of preservation indicates that the depth of the lysocline in the eastern equatorial Pacific has remained approximately stationary during the past 370,000 yr.

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