Research was funded by the German Science Foundation (DFG Re1051/4-1, 4-2, 4-3 to R.R. and J.R.). We thank Ian Alexander and Colin Chillcott for giving technical assistance on the mass spectrometer in Edinburgh and Gideon Henderson (Lamont-Doherty Earth Observatory, U.S.A.) for providing U/Th dates. We thank the Core Repository in Bremen for providing additional samples from Hole 1006B. We thank Gerald Haug and an anonymous reviewer for critically reading the first draft of the manuscript.