Echols, Dorothy J. (1985): Lower Oligocene through Pleistocene planktonic foraminiferal biostratigraphy, North Atlantic sites 558 and 563 (Mid-Atlantic Ridge). Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Bougault, Henri, Cande, Steven C., Brannon, Joyce C., Christie, David M., Clark, Murlene, Curtis, Doris Malkin, Drake, Natalie, Echols, Dorothy J., Hill, Ian Ashley, Khan, Mohammed Javed, Mills, William G., Neuser, Rolf, Rideout, Marion L., Weaver, Barry L., Whalen, Elizabeth (editor), Initial reports of the Deep Sea Drilling Project; covering Leg 82 of the cruises of the Drilling Vessel Glomar Challenger; Ponta Delgada, Azores, to Balboa, Panama; September-November 1981, 82, 547-558, georefid:1985-081675