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At Holes 548 and 549A, almost complete sections of Quaternary deposits were recovered. Floral associations were studied in closely spaced samples. Nannofossils are moderately well preserved and contain few reworked forms. The following nannofossils were studied in detail: Gephyrocapsa (closed Gephyrocapsa with G. producta, G. sinuosa, and G. caribbeanica; open Gephyrocapsa: G. doronicoides, subdivided into five variants, and G. ocβanica; G. protohuxleyi; small Gephyrocapsa: G. ericsonii and G. aperta), Pseudoemiliania lacunosa (a round and an elliptical type), Helicopontosphaera (H. sellii, H. gr. kamptneri, and H. neogranulata), Cyclococcolithina (three variants of C. leptopora and two variants of C. macintyrei), Coccolithus pelagicus (C. pelagicus s.s. and two variants). These taxa were used to define supplementary datum levels to be added to the conventional nannofossil datums and to the paleomagnetic events on the curves of sediment accumulation rate for each site. Thus, it is possible to establish a tentative, very detailed nannofossil stratigraphy for the Quaternary. The influence of glaciation on the calcareous phytoplankton is evident, especially during the last 500,000 yrs. The nannofossil total-abundance curve shows fluctuations that resemble closely the fluctuations in the major climatic cycles described by Ruddiman and Mclntyre (1976).

Quaternary Nannofossils from Goban Spur, Eastern North Atlantic Ocean, Deep Sea Drilling Project Holes 548 and 549A