Paleocene sequence stratigraphy on the New Jersey coastal plain

Author(s): Harris, Ashley; Miller, Kenneth G.; Cramer, Benjamin; Olsson, Richard K.; Sugarman, Peter J.; Browning, James V.
Author Affiliation(s): Primary:
Rutgers University, Department of Geological Sciences, Piscataway, NJ, United States
Other:
University of Oregon, United States
New Jersey Geological Survey, United States
Volume Title: Geological Society of America, 2006 annual meeting
Source: Abstracts with Programs - Geological Society of America, 38(7), p.127; Geological Society of America, 2006 annual meeting, Philadelphia, PA, Oct. 22-25, 2006. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592 CODEN: GAAPBC
Note: In English
Summary: We used benthic foraminifers and integrated stratigraphic studies to assess water-depth changes of four Paleocene sequences identified in coreholes at Bass River, Ancora, and Millville, NJ (ODP Leg 174AX). These sequences are located in the Vincentown Formation (glauconitic silts and clays) and the underlying Hornerstown Formation (glauconitic clay). Sequence boundaries were identified by hiatuses, unconformities and variations in benthic foraminiferal biofacies. Factor analysis was performed on benthic foraminifers at each corehole to identify foraminiferal assemblages and aid sequence boundary identification and paleoenvironment interpretation. We identified three distinct benthic foraminiferal assemblages and estimated their associated paleowater depths. Gavelinella beccariformis parvula is a middle-outer shelf species that dominated the first assemblage. The second assemblage represents an outer shelf environment dominated by Pulsiphonina prima and Anomalinoides acuta. Tappanina selmensis is an opportunistic species that dominated the third assemblage. We use faunal metrics (e.g., % planktonic foraminifera and census data) and a paleoslope model to interpret the paleowater depth of each assemblage. Paleowater depths were ∼80 m during the early Paleocene, with a maximum water depth of 100 m at Bass River. A long-term water depth shallowing of ∼20 m is observed through the middle-late Paleocene toward the Carbon Isotope Excursion (CIE). The shallowing trend reverses at the CIE, with a water depth increase of ∼80 m. Location, identification and paleoenvironments of these sequences are consistent with previous New Jersey coastal plain studies at Island Beach (ODP Leg 150X) and DSDP Sites 605, 612, and 613. We compare the ages of Paleocene sequence boundaries in NJ with global oxygen isotope records. Oxygen isotope increases at 59.5 Ma and 64.6 Ma may correlate with sequence boundaries in NJ, potentially linking sea level falls with glacioeustatic lowering.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Anomalinoides acuta; Assemblages; Atlantic Coastal Plain; Bass River; Benthic taxa; Biostratigraphy; C-13/C-12; Carbon; Cenozoic; Eustasy; Factor analysis; Foraminifera; Gavelinella beccariformis parvula; Hornerstown Formation; Identification; Interpretation; Invertebrates; Isotope ratios; Isotopes; Leg 174AX; Marine environment; Microfossils; New Jersey; O-18/O-16; Ocean Drilling Program; Oxygen; Paleoenvironment; Pleistocene; Protists; Pulsiphonina prima; Quaternary; Regression; Sea-level changes; Sequence stratigraphy; Shelf environment; Stable isotopes; Statistical analysis; Tappanina selmensis; Unconformities; United States; Variations; Vincentown Formation
Coordinates: N383000 N402800 W0740000 W0753500
Record ID: 2008068991
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States