Abstract
Cretaceous sediments were recovered at Sites 415 and 416, drilled during DSDP Leg 50. Jurassic sediments were only found in Hole 416A. Figure 1 shows the site locations and Figure 2 shows the calcareous-nannofossil zonation of the cored interval. Calcareous nannofossils from 24 samples of Hole 415A and 194 samples of Hole 416A were studied on smear slides and identified with a light microscope. Species discussed are listed in Table 1. Abundance and preservation of the calcareous nannofossil species were determined for all samples. Estimates of abundance were made with the light microscope at a magnification of × 1560. Species are recorded as: abundant (A), more than 25 specimens per traverse; common (C), 6-25 specimens per traverse; few (F), 3-5 specimens per traverse; and rare (R), 1-2 specimens per traverse. Distribution of nannofossils of Holes 416A and 415A is shown in Figures 3 (back pocket, this volume) and 4, respectively.
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