Biofacies and lithofacies evidence for paleoenvironmental interpretations of upper Neogene sequences on the New Jersey continental shelf (ODP Leg 174A)

Author(s): Katz, Miriam E.; Miller, Kenneth G.; Mountain, Gregory S.
Author Affiliation(s): Primary:
Rutgers University, Department of Geological Sciences, Piscataway, NJ, United States
University of Massachusetts, United States
Lamont-Doherty Earth Observatory, United States
Volume Title: Micropaleontologic proxies for sea-level change and stratigraphic discontinuities
Volume Author(s): Olson, Hilary Clement, editor; Leckie, R. Mark
Source: Micropaleontologic proxies for sea-level change and stratigraphic discontinuities, edited by Hilary Clement Olson and R. Mark Leckie. Special Publication - Society for Sedimentary Geology, Vol.75, p.131-146. Publisher: Society for Sedimentary Geology (SEPM), Tulsa, OK, United States. ISSN: 1060-071X. ISBN: 1-56576-084-0
Note: In English. 68 refs.; illus., incl. sect., 2 tables, geol. sketch map
Summary: 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 foraminiferal, 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.
Year of Publication: 2003
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Atlantic Ocean; Benthic taxa; Biofacies; Biostratigraphy; Cenozoic; Continental shelf; Depositional environment; Foraminifera; Geophysical methods; Geophysical profiles; Geophysical surveys; Invertebrata; Isotope ratios; Isotopes; Leg 174A; Lithofacies; Marine environment; Marine sediments; Microfossils; Neogene; New Jersey; North Atlantic; Northwest Atlantic; O-18/O-16; ODP Site 1071; ODP Site 1072; Ocean Drilling Program; Oxygen; Paleobathymetry; Paleoenvironment; Plankton; Protista; Sediments; Seismic methods; Seismic profiles; Seismic stratigraphy; Sequence stratigraphy; Stable isotopes; Stratigraphic units; Surveys; Tertiary; United States
Coordinates: N392156 N392257 W0724140 W0724328
Record ID: 2004068280
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