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Late Neogene-Quaternary Planktic Foraminiferal Biostratigraphy and Biochronology from ODP Site 807A, Ontong Java Plateau, Western Equatorial Pacific
T. Kaushik, , D.K. Sinha
Published in Cushman Foundation
Volume: 50
Issue: 2
Pages: 111 - 127
A biostratigraphic and biochronological study from the late Neogene-Quaternary section of Ocean Drilling Pro-gram (ODP) Site 807A, located on the Ontong Java Plateau, western equatorial Pacific, revealed 50 planktic foraminiferal events, enabling the identification of eight late Neogene-Quaternary biozones, from the Globorotalia plesiotumida Interval Zone to the Globorotalia truncatulinoides Interval Zone. A significant faunal turnover (17 events) from late Pliocene identified in cores 7 and 8, between 70 and 55 meters below seafloor (mbsf), and spanning 0.67 million years (Myr). This noteworthy turnover may be the result of a shift in oceanographic conditions pertaining to the closure of the Indo-Pacific Seaway, followed by the Northern Hemisphere Glaciation. This study provides a high resolution biostrati-graphic and biochronological framework for ODP Site 807A that will aid in correlation and timing the various paleoceano-graphic changes over the last 6 million years in the western equatorial Pacific. © 2020 Cushman Foundation. All rights reserved.
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