This research used samples provided by the Ocean Drilling Program (ODP). ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc. Funding for this research was provided by the Deutsche Forschungsgemeinschaft (DFG) in the context of the graduate research program "Evolutionary Transformations and Mass Extinctions" and by DFG project Du 129/21.
We thank ODP for providing us with Leg 183 samples and the members of the Shipboard Scientific Party for sample collection. Thanks to Woody Wise, Helen Coxall, and James Arney for providing unpublished biostratigraphic data and to Maria Antretter for unpublished magnetic polarity data. Many thanks to the Shipboard Scientific Party for help and discussions, and to Jean-Pierre Caulet, Pat Quilty, Atsushi Takemura, and Paul Wallace for constructive reviews.