Coccolith and Silicoflagellate Stratigraphy, Northern Mid-Atlantic Ridge and Reykjanes Ridge, Deep Sea Drilling Project Leg 49

Abstract

Leg 49 of the Deep Sea Drilling Project recovered 192 cores at eight drilling sites, 407 through 414 (Figure 1). Light-microscope techniques were used to study the coccoliths, silicoflagellates, and sponge spicules of 120 samples from these cores. The coccolith zonation of the samples follows Bukry (1975a), and is summarized in Figure 2. Silicoflagellate zonation, summarized in Figure 3, is explained in text. Siliceous sponge spicules are common in many samples and are briefly discussed and illustrated. One new silicoflagellate, Distephanus sulcatus, from the Pliocene of Site 407, is described.