Abstract
Benthic foraminiferal biofacies and integrated stratigraphic studies of the sediments recovered from the Island Beach borehole in New Jersey reveal that the Paleocene strata penetrated in the borehole can be divided into three sequences, which we designate pa1, pa2, and pa3 in stratigraphically ascending order. Sequence boundaries are recognized by gamma-ray log excursions, hiatuses, and unconformities. Depositional paleoenvironments for each sequence are recognized by lithology and benthic foraminiferal biofacies. Strata in these sequences exhibit upward shallowing from outer neritic to middle neritic environments. Maximum flooding surfaces are associated with the greatest benthic foraminiferal biofacies changes, shell beds, and secondary gamma-ray kicks. Biofacies changes across sequence boundaries are less severe; we attribute this to the effects of a longer ter m decrease in water depth superimposed on these shorter-term transgressive/regressive cycles.
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