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Biofacies and Lithofacies Evidence for Paleoenvironmental Interpretations of Upper Neogene Sequences on the New Jersey Continental Shelf (Odp Leg 174A)

By
Miriam E. Katz
Miriam E. Katz
Department of Geological Sciences, Rutgers University, Piscataway, New Jersey 08854, U.S.A.
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Kenneth G. Miller
Kenneth G. Miller
Department of Geological Sciences, Rutgers University, Piscataway, New Jersey 08854, U.S.A.Lamont-Doherty Earth Observatory of Columbia University, Palisades New York 10964, U.S.A.
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Gregory S. Mountain
Gregory S. Mountain
Lamont-Doherty Earth Observatory of Columbia University, Palisades New York 10964, U.S.A.
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Published:
January 01, 2003

Abstract

We evaluate late Miocene–Recent paleoenvironments, paleobathymetry, and depositional facies recovered at two sites drilled by Ocean Drilling Program Leg 174A on the New Jersey continental shelf. Based on seismic stratigraphy, previous studies suggested that the New Jersey margin sequences are primarily either highstand deposits or lowstand systems tracts. However, benthic foraminiferal biofacies and planktonic foraminiferal abundances proved to be key to deciphering systems tract development. By integrating foramin-iferal, lithologic, and downhole logging evidence within a seismically defined sequence stratigraphic framework, we show that Pleistocene sequences cored by Leg 174A are characterized by transgressive and highstand deposits, whereas Miocene sequences consist of lowstand, transgressive, and highstand deposits, with repeated flooding surfaces indicating parasequences. We propose that the erosion responsible for the shelf sequence boundaries can be attributed to mean lowerings of base level in response to changes in the mean states of glaciation that marked: (1) the Miocene increase in ice volume and glacioeustatic lowering; (2) the transition to Northern Hemisphere–dominated glaciation; and (3) the transition to the large eustatic fluctuations of the middle–late Pleistocene.

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SEPM Special Publication

Micropaleontologic Proxies for Sea-Level Change and Stratigraphic Discontinuities

Hilary Clement Olson
Hilary Clement Olson
Institute for Geophysics, University of Texas, 4412 Spicewood Springs Rd., Bldg. 600, Austin, Texas 78759-8500, U.S.A.
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R. Mark Leckie
R. Mark Leckie
Department of Geosciences, University of Massachusetts, 611 N. Pleasant St., Amherst Massachusetts 01003, U.S.A.
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SEPM Society for Sedimentary Geology
Volume
75
ISBN electronic:
9781565762121
Publication date:
January 01, 2003

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