Tiedemann, Ralf, Arne Sturm, Silke Steph, Steven P Lund, and Joseph Stoner. 2007. Astronomically Calibrated Timescales From 6 to 2.5 Ma and Benthic Isotope Stratigraphies, Sites 1236, 1237, 1239, and 1241. : College Station, Tex. : Ocean Drilling Program, Texas A & M University.