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Cretaceous sediments were recovered in all five sites drilled during Leg 41. Jurassic sediments were only found at Site 367. Figure 1 shows the site locations and Figures 2 and 3 show site ages and correlations. Two of the sites were in deep basins (367 and 370), two were on rises (366 and 368), and one was on the continental slope (369). Calcareous nannoplankton assemblages range from Oxfordian to Maestrichtian age in the samples studied. The determination of the calcareous nannoplankton (Table 1) was mainly made with light microscopy on smear slides prepared from samples which were treated with an ultrasonic apparatus. Some selected wellpreserved samples were also studied with the scanning electron microscope. Nannofossil abundance and preservation were estimated for all samples studied. Species abundance was determined for about half of the samples. The estimation method was modified from the one used by Hay (1970) and Gartner (1972). According to this technique, the abundance of a species is estimated with the light microscope at a magnification of 1560X as being present as: 1-10 specimens per field (A); 1 specimen in 10 fields (C); 1 specimen in 50 fields (F); 1 specimen in 200 fields (R). The abundance of species was expressed with abundant (A), common (C), few (F), and rare (R). The samples are listed in the tables according to site number, section, and interval. For each sample the depth has also been given in meters below sea floor. All scanning electron microscope prints were taken by E. Knickrehm with the Autoscan microscope of the Federal Institute for Geosciences and Natural Resources, Hannover, Germany.

Mesozoic Calcareous Nannoplankton of the Eastern North Atlantic, Leg 41