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Earth’s climate during the Maastrichtian (latest Cretaceous) was punctuated by brief warming and cooling episodes, accompanied by perturbations of the global carbon cycle. Superimposed on a long-term cooling trend, the middle Maastrichtian is characterized by deep-sea warming and relatively high values of stable carbon-isotope ratios, followed by strong climatic variability towards the end of the Cretaceous. A lack of knowledge on the timing of climatic change inhibits our understanding of underlying causal mechanisms. We present an integrated stratigraphy from Integrated Ocean Drilling Program (IODP) Site U1403, providing an expanded deep ocean record from the North Atlantic (Expedition 342, Newfoundland Margin). Distinct sedimentary cyclicity suggests that orbital forcing played a major role in depositional processes, which is confirmed by statistical analyses of high resolution elemental data obtained by X-ray fluorescence (XRF) core scanning. Astronomical calibration reveals that the investigated interval encompasses seven 405-kyr cycles (Ma4051 to Ma4057) and spans the 2.8 Myr directly preceding the Cretaceous/Paleocene (K/Pg) boundary. © 2017 Gebrüder Borntraeger, Stuttgart, Germany DOI: 10.1127/nos/2017/0398 www.borntraeger-cramer.de 0078-0421/2017/0398 $ 4.00 Authors’ addresses: 1 Institute of Geosciences, Goethe-University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany. 2 present address: Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, United Kingdom. 3 Institute of Earth Sciences, Ruprecht-Karls-University Heidelberg, Im Neuenheimer Feld 234–236, 69120 Heidelberg, Germany. 4 School of Natural Sciences and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan. 5 CEREGE, Université Aix-Marseille, Europole de l’Arbois BP 80 1, 13545 Aix en Provence, France. 6 present address: Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades NY 10964, USA. 7 Integrated Ocean Drilling Program, Texas A&M, 1000 Discovery Drive, College Station, TX 77845-9547, USA. 8 Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655 Hannover, Germany. 9 Department of Geology and Geophysics, Yale University, 210 Whitney Ave, New Haven, CT 06511, USA. 10 Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0244, USA. 11 MARUM-Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse 8, 28359 Bremen, Germany. 12 School of Environment, Earth & Ecosystem Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK. 13 National Oceanography Centre Southampton, University of Southampton, Waterfront Campus, European Way, South amp ton SO14 3ZH, UK. * Corresponding author: Sietske J. Batenburg, Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, United Kingdom. sbatenburg@gmail.com

Late Maastrichtian carbon isotope stratigraphy and cyclostratigraphy of the Newfoundland Margin (Site U1403, IODP Leg 342)