Siliceous diatom valves exhibit better preservation in surface sediments of the eastern than of the western equatorial Pacific. The preservation noticeably decreases westward and is enhanced with increasing depth of water.

Diatom preservation generally improves from glacial through Holocene sediment sequences. Superimposed on this trend are two zones of poorer preservation within the last 20,000 yr. Preservation of diatoms appears to be inverse to that of calcareous Foraminifera throughout the sequences studied in the equatorial Pacific.

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