Magnetostratigraphically-calibrated dinoflagellate cyst bioevents for the uppermost Eocene to lowermost Miocene of the western North Atlantic (IODP Expedition 342, Paleogene Newfoundland sediment drifts)

TitleMagnetostratigraphically-calibrated dinoflagellate cyst bioevents for the uppermost Eocene to lowermost Miocene of the western North Atlantic (IODP Expedition 342, Paleogene Newfoundland sediment drifts)
Publication TypeJournal Article
Year of Publication2016
AuthorsEgger L.M, Sliwinska K.K, van Peer T.E, Liebrand D., Lippert P.C, Friedrich O., Wilson PA, Norris RD, Pross J
JournalReview of Palaeobotany and Palynology
Volume234
Pagination159-185
Date Published2016/11
Type of ArticleArticle
ISBN Number0034-6667
Accession NumberWOS:000387526600012
Keywordsantarctic glaciation; Biostratigraphy; Dinoflagellates; foraminifera; Integrated Ocean Drilling Program; middle eocene; North Atlantic; offshore eastern canada; Oligocene; oligocene transition; Onset; paleogene; sea basin; stratigraphy; zonation
Abstract

The Oligocene epoch represents a somewhat neglected chapter in paleoclimate and paleoceanographic history, which is at least partially due to the scarcity of complete Oligocene sedimentary archives and poor biostratigraphic age control. Many of the biotic events registered in Oligocene microfossils are strongly diachronous across latitudes as a response to increased global cooling and enhanced meridional temperature gradients. To improve biostratigraphic age control for the Oligocene of the North Atlantic Ocean, we carried out a high-resolution study of dinoflagellate cysts from Integrated Ocean Drilling Program (IODP) Sites U1405, U1406 and U1411 off Newfoundland. Together the sites comprise an apparently complete uppermost Eocene (34.9 Ma) to lowermost Miocene (21.7 Ma) sequence with good magnetostratigraphic age control. This allows us to firmly tie identified dinoflagellate cyst bioevents to the geomagnetic polarity timescale. In the dinoflagellate cyst assemblages studied we have identified and magnetostratigraphically-calibrated ten first and 19 last appearance datums. Our magnetostratigraphically-calibrated dinocyst-based biostratigraphy, which is based on an average sample resolution of a sample very similar to 150 kyrs, will contribute to an improved age framework for future paleoceanographical studies in the higher-latitude North Atlantic. (C) 2016 Elsevier B.V. All rights reserved.

DOI10.1016/j.revpalbo.2016.08.002
Student Publication: 
No