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Miller K G and Snyder S W Eds 1997 Proceedings of the Ocean Drilling Program Scientific Results Vol 150X 14 EARLY TO MIDDLE MIOCENE SEQUENCES SYSTEMS TRACTS AND BENTHIC FORAMINIFERAL BIOFACIES NEW JERSEY COASTAL PLAIN 1 Kenneth G Miller 2 3 Scott Rufolo 2 Peter J Sugarman 4 Stephen F Pekar 2 James V Browning 2 and David W Gwynn2 ABSTRACT We identified and dated nine lower to middle Miocene sequences at the Island Beach Atlantic City and Cape May New Jersey boreholes integrating Sr isotopic lithofacies log and benthic foraminiferal biofacies data in a sequence stratigraphic framework Miocene sequences typically shallow upsection representing three major lithofacies 1 thin shelly glauconite sands of the Transgressive Systems Tracts deposited in inner middle 0 to 100 m paleodepth neritic environments 2 medial silty clays of the lower Highstand Systems Tracts deposited in neritic prodelta environments and 3 upper quartz sands of the upper Highstand Systems Tracts deposited in inner neritic near shore and delta front environments Sedimentation rates were low moderate in the earliest Miocene 5 24 m m y increased to 40 90 m m y at about 22 Ma as deltaic sedimentation began and remained high and uniform through the middle Miocene We develop a benthic foraminiferal biofacies model for the inner to middle neritic zones 0 to 100 m paleodepth and show that these biofacies follow a predictable succession in the se transgressive regressive sequences The nomenclature and usage of the Kirkwood Formation is discussed and the Brigantine Member is formally named Onshore sequences result from a complex interplay of changes in eustasy tectonics and sediment supply Correlation of sequence boundaries onshore with offshore and Exxon records indicate that they represent global lowerings of baselevel Correlation of the sequence boundaries with 18O increases show that they were formed during glacioeustatic lowerings Although eustasy controls the timing of sequences the preservation of



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