The method of paleodepth backtracking consists of assigning depths of deposition to dated sediments for which the age of underlying basement is known. Paleobathymetric facies distributions in the equatorial Pacific suggest minor fluctuations of the calcite compensation depth (CCD) in post-Eocene time, but a relatively shallow CCD during the Eocene period. Fluctuations in the Atlantic show an entirely different pattern. It is speculated that CCD fluctuations in different ocean basins may be in part parallel and in part opposed in response to such factors as varying global carbonate supply, amount of carbonate deposited in shelf seas, latitudinal productivity variation, and deep-sea circulation patterns.

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