02344nas a2200301   4500000000100000008004100001653002000042653002000062653003800082653001900120653001400139653001400153100001500167700001900182700001700201700002200218700001800240700002100258700001600279700001900295700001600314245020800330856007100538300002200609490000800631520138900639022001402028       2016                            d10abiostratigraphy10aDinoflagellates10aIntegrated Ocean Drilling Program10aNorth Atlantic10aOligocene10aPaleogene1 aLisa Egger1 aKatarzyna nska1 aTim van Peer1 aDiederik Liebrand1 aPeter Lippert1 aOliver Friedrich1 aPaul Wilson1 aRichard Norris1 aJörg Pross00aMagnetostratigraphically-calibrated dinoflagellate cyst bioevents for the uppermost Eocene to lowermost Miocene of the western North Atlantic (IODP Expedition 342, Paleogene Newfoundland sediment drifts)  uhttp://www.sciencedirect.com/science/article/pii/S0034666716300100  a159\textendash1850 v2343 a<p>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 every \~ 150 kyrs, will contribute to an improved age framework for future paleoceanographical studies in the higher-latitude North Atlantic.</p>  a0034-6667