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Three DSDP Leg 36 sites drilled in the high latitudes of the southwestern Atlantic Ocean yielded thick sections of nannofossilbearing sediments of Late Jurassic, Cretaceous, and Tertiary age. Oxfordian, Albian, and Maestrichtian assemblages are diverse and well preserved. Aptian, Cenomanian, and Santonian nannofloras are generally of low diversity and poorly preserved; the result of unfavorable paleoecological and depositional conditions. High latitude provincial forms are common in the Late Cretaceous and Tertiary sections; these have prompted the proposal of new zones or subzones for the Albian (Biscutum constans, Sollasites falklandensis, and Tranolithus orionatus subzones) and Paleocene {Heliolithus universus Zone). Severe climatic conditions limit post-Eocene Coccolith assemblages to fewer than one-dozen species; thus zonations are virtually unworkable for the Neogene section present. Exceptional preservation of some assemblages, particularly those of the Oxfordian, Maestrichtian, and certain levels of the Aptian permitted the identification of 32 new calcareous nannofossil species as well as 12 new genera (Acuturris, Axopodorhabdus, Boletuvelum, Centosphaera, Misceomarginatus, Monomarginatus, Okkolithus, Orastrum, Phanulithus, Pharus, Seribiscutum, Teichorhabdus).

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Mesozoic and Cenozoic Calcareous Nannofossils Recovered by DSDP Leg 36 Drilling on the Falkland Plateau, Southwest Atlantic Sector of the Southern Ocean