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Calcareous nannofossils were obtained from all sites drilled on Leg 39 (Figure 1). Late Albian and Turonian through Pleistocene assemblages were studied. Preservation varies considerably, usually deteriorating down the hole except for the Paleocene, where preservation is often better than in the overlying Eocene. Generally, MartinFs (1971) zonation, and to a lesser extent Bukry's (1973c), were used as a scale for the Tertiary; a partly emended zonation is proposed for the Cretaceous part of the sequence (Tables 1 and 2). Discoaster/Chiasmolithus ratios were estimated in the Oligocene and Eocene samples, and suggest relatively warm conditions, except for the Oligocene at Site 357 and the middle Eocene at Sites 354, 356, 357, and 358. Braarudosphaeraceae are absent or very rare in the Neogene at Sites 353, 354, 356, and 358, rare in the Oligocene and upper Eocene at Site 357 and the Miocene at Site 355 (turbidite ?), and few in the middle Eocene at Site 357 and the upper Eocene at Site 359. No Braarudosphaera chalk was recovered, but Braarudosphaera is common in some lower Paleocene samples at Site 356 and absent or rare in the Cretaceous samples. Special attention was given to the succession of first occurrences of species of Cruciplacolithus, Chiasmolithus, Ericsonia, Hornibrookina, Fasciculithus, Heliolithus, discoasters, and Prinsiaceae in the Paleocene at Site 356. Markalius is suggested to be the ancestor of fasciculiths and discoasters, and Hornibrookina to have evolved from Biscutum. The following new species are described: Amaurolithus ninae, Ceratolithus atlanticus, Chiasmolithus frequens, Cruciplacolithus notus, C. primus, Markalius variabilis, Neochiastozygus cearae, Triquetrorhabdulus challengeri, Ellipsolithus bollii, and Hornibrookina edwardsi

Albian to Pleistocene Calcareous Nannofossils from the Western South Atlantic, DSDP Leg 39