Palynological character of shallow marine Miocene sequences; data from the mid-Atlantic transect, New Jersey (ODP legs 174A and 174AX)

Author(s): Tiffin, Sarah H.; McCarthy, Francine M. G.
Author Affiliation(s): Primary:
Brock University, Department of Earth Sciences, St. Catharines, ON, Canada
Volume Title: Geological Society of America, 2000 annual meeting
Source: Abstracts with Programs - Geological Society of America, 32(7), p.342; Geological Society of America, 2000 annual meeting, Reno, NV, Nov. 9-18, 2000. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592 CODEN: GAAPBC
Note: In English
Summary: Palynomorphs, specifically dinoflagellate cysts and pollen grains, have conventionally been used in paleoclimate reconstructions. Dinocysts and pollen in samples from the New Jersey Margin, however, are used in this study to provide valuable insight into both the age and systems tract character of sequences found both onshore and offshore. Palynological data from ODP Leg 174A continental shelf Site 1071 and the Leg 174AX Ocean View onshore borehole will be discussed. The data allow Miocene sequences to be correlated from previously analyzed slope sites (ODP Leg 150), across the New Jersey shelf, and onto the Atlantic Coastal Plain. One of the main objectives of the Mid-Atlantic Transect is to improve the dating resolution of seismically imaged unconformity sequences, especially at sites where paleobathymetry was shallow enough to be sensitive to eustatic variations. Miocene sediments had been difficult to date using the more established methods of foraminifer biostratigraphy or magnetostratigraphy as the shallow-water paleoenvironments excluded pelagic biostratigraphic markers, and magnetostratigraphy proved difficult in the coarse neritic sediments. Maximum and minimum ages have been assigned to samples taken from within sequences and near sequence boundaries with the aid of the calibrated dinocyst zonation of de Verteuil and Norris (1996). Changes in relative sea level during the Miocene are observable when the concentrations and species diversity of pollen and dinocysts, the pollen to dinocyst ratio (P:D), and the ratio of gymnosperm pollen to angiosperm pollen are plotted over the interval.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Coastal Plain; Atlantic Ocean; Biostratigraphy; Cenozoic; Correlation; Cysts; Dinoflagellata; Eustasy; Foraminifera; Invertebrata; Leg 174A; Leg 174AX; Magnetostratigraphy; Marine environment; Microfossils; Miocene; Miospores; Neogene; New Jersey; North Atlantic; Northwest Atlantic; Ocean Drilling Program; Paleoclimatology; Paleoenvironment; Palynomorphs; Pollen; Protista; Reconstruction; Shallow-water environment; Species diversity; Tertiary; United States; Variations
Coordinates: N391300 N394000 W0721600 W0724400
N383000 N401500 W0740000 W0753500
Record ID: 2003064995
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States