Upper Eocene through Pleistocene benthic foraminifers were studied in 33 samples from DSDP Site 369, off northwest Africa. A total of 197 taxa were identified. The unilocular, calcareous species were not included. The assemblage found is qualitatively the richest as compared with the faunas of the same age at other sites previously studied. One probable explanation is the relatively high productivity of this area. A faunal turnover occurred between Eocene and Oligocene time. The following Eocene species do not cross the Eocene-Oligocene boundary: Nuttallides truempyi, Bolivina cf. hebes, Bolivina beyrichi, Orthomorphina mutata and Aragonia aragonensis. the Oligocene and Pleistocene assemblages consist essentially of the same species. Based on the study of ten reliable DSDP sites studied previously and DSDP Site 369, the following 12 species are considered suitable as guide-fossils in the Oligocene-Pleistocene sequence: Buliminella carteri, Bulimina jarvisi, Turrillina alsatica, Bulimina macilenta, Cassidulina subglobosa horizontalis, Cassidulina cuneata, Cibicides notocenicus, Planulina marilana gigas, Pleurostomella obtusa, Vulvulina pennatula, s.l., Cibicides wuellerstorfi and Pyrgo murrhina. However, they are only useful for identifying major stratigraphic units (systems and subsystems). The dominant species at Site 369 are established and compared with those of other sites. The interoceanic dominant taxa typical of the bathyal Oligocene-Pleistocene sequence are determined.