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Paleocene calcareous nannofossil biogeography of DSDP Sites 354 and 356 is delineated and compared with the overall biogeographic patterns of the Atlantic Ocean, (λ-mode varimax factor analysis defines five major Paleocene assemblages, four of which are similar to those recognized in the low to mid latitudes of the rest of the Atlantic. A fifth assemblage (Prinsius aff. P. dimorphosus) becomes dominant in upper Danian. Temporal dominance of various assemblages conforms to the overall latitudinal migrationary patterns recorded for the Atlantic (Haq and Lohmann, 1976) and confirm that the early Paleocene was relatively warm, followed by a cool period in middle Paleocene and a marked warming trend in the late Paleocene.

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Contribution to the Paleocene Calcareous Nannofossil Biogeography of the Central and Southwest Atlantic Ocean (Ceará Rise and São Paulo Plateau, DSDP Leg 39)