Paleobathymetric trends of Cenozoic sedimentary sections from widely separated geographic areas show striking similarities. In areas examined, early and middle Eocene and middle Oligocene to middle Miocene ages are intervals of deeper water sedimentation and warm oceanic temperatures. Late Eocene to early Oligocene and the late Miocene to Holocene ages are intervals of shallow-water deposition, colder oceanic temperatures, and glaciation. Some large-scale tectonic cycle, possibly related to convection cells and a phase change, may be responsible for these observed trends.

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