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During Leg 49, 11 holes were drilled at eight sites in the North Atlantic Ocean (Figure 1). Three of the sites (407, 408, 409) are on the Reykjanes Ridge, south of Iceland, one (410) is near the crest of the Mid-Atlantic Ridge at 45° North latitude, three (411, 412, 413) are in or near the FAMOUS area just south of the Azores, and one (414) is on Cruiser-Irving Seamount. The oldest sediments encountered are lower middle Oligocene (Helicopontosphaera reticulata Zone), at Site 407. Sediments generally contain abundant, well-preserved nannofossils. In those samples containing few nannofossils, large amounts of volcanic sediments and siliceous micirofossils account for the dilution. There is little evidence of dissolution. Species are relatively diverse, although many of the indicator species commonly used for zonation in lower latitudes (ceratoliths, discoasters, and sphenoliths) are missing.

Calcareous Nannofossils from the North Atlantic Ocean, Leg 49, Deep Sea Drilling Project