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Abstract:

Paleoslope models of foraminifera in the Upper Cretaceous of the New Jersey coastal plain are utilized to estimate paleobathymetric change during cycles of rising and falling sea level. The paleoslope method estimates change in sea level from the distribution of foraminiferal assemblages and species on a baseline parallel to the regional dip. The paleoslope is the restoration of the original depositional slope of the basin. The paleobathymetry of the foraminifera along the paleoslope is estimated from the gradient of the original depositional slope. Application of the paleoslope model to the Campanian of New Jersey indicates a maximum rise of sea level of 90 m and 80 m, respectively, during two cycles of sea-level change. By extension, a paleodepth curve is derived for the other cycles in the Late Cretaceous. Eight cycles are recognized in the Late Cretaceous section of New Jersey.

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