Response of Late Cretaceous Migrating Deltaic Facies Systems to Sea Level, Tectonics, and Sediment Supply Changes, New Jersey Coastal Plain, U.S.A (original) (raw)
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Upper Cretaceous sequences and sea-level history, New Jersey Coastal Plain
Geological Society of America Bulletin, 2004
We developed a Late Cretaceous sealevel estimate from Upper Cretaceous sequences at Bass River and Ancora, New Jersey (ODP [Ocean Drilling Program] Leg 174AX). We dated 11-14 sequences by integrating Sr isotope and biostratigraphy (age resolution ؎0.5 m.y.) and then estimated paleoenvironmental changes within the sequences from lithofacies and biofacies analyses. Sequences generally shallow upsection from middle-neritic to inner-neritic paleodepths, as shown by the transition from thin basal glauconite shelf sands (transgressive systems tracts [TST]), to medial-prodelta silty clays (highstand systems tracts [HST]), and finally to upperdelta-front quartz sands (HST). Sea-level estimates obtained by backstripping (accounting for paleodepth variations, sediment loading, compaction, and basin subsidence) indicate that large (Ͼ25 m) and rapid (K1 m.y.) sea-level variations occurred during the Late Cretaceous greenhouse world. The fact that the timing of Upper Cretaceous sequence boundaries in New Jersey is similar to the sea-level lowering records of Exxon Production Research Company (EPR)
2000
The New Jersey Coastal Plain Drilling Project continuously cored three boreholes at Island Beach, Atlantic City, and Cape May, New Jersey. Sequence boundaries in the cores are expressed as physical surfaces, lithofacies breaks, and paraconformities (hiatuses) recognized using biostratigraphy and Sr-isotopic stratigraphy. By drilling along dip and strike profiles, we assembled a mosaic of 29 Paleocene to Miocene sequences and dated them using integrated magnetostratigraphy, biostratigraphy, and isotopic stratigraphy.