Cyclostratigraphy and eccentricity tuning of the early Oligocene through early Miocene (30.1–17.1 Ma): Cibicides mundulus stable oxygen and carbon isotope records from Walvis Ridge... av Liebrand, D, Beddow, H, Lourens, L, Pälike, H, Raffi, I, Bohaty, S, Hilgen, F, Saes, M, Wilson, P, van Dijk, A, Hodell, D, Kroon, D, Huck, C, Batenburg, S