Olafsson, Gunnar (1989): Quantitative calcareous nannofossil biostratigraphy of upper Oligocene to middle Miocene sediment from ODP Hole 667A and middle Miocene sediment from DSDP Site 574. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Ruddiman, William F., Sarnthein, Michael, Baldauf, Jack G., Backman, Jan, Bloemendal, Jan, Curry, William B., Farrimond, Paul, Faugeres, Jean-Claude, Janecek, Thomas R., Katsura, Yuzo, Manivit, Helene, Mazzullo, James, Mienert, Juergen, Pokras, Edward M., Raymo, Maureen E., Schultheiss, Peter J., Stein, Ruediger, Tauxe, Lisa, Valet, Jean-Pierre, Weaver, Philip P. E., Yasuda, Hisato, Eastern tropical Atlantic, covering Leg 108 of the cruises of the drilling vessel JOIDES Resolution, Marseille, France, to Dakar, Senegal, Sites 657-668, 18 February 1986-17 April 1986, 108, 9-22, georefid:1990-028949