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Leg 22 of the Deep Sea Drilling Project, January to March 1972, which began at Darwin, Australia, and ended at Colombo, Ceylon, investigated the eastern Indian Ocean, recovering 275 cores at eight drilling sites (Figure 1). Light-microscope techniques were used to study the coccoliths and silicoflagellates in 312 samples from these cores and to indicate the presence of diatoms. Of these phytoplankton groups, coccoliths are present most consistently. The zonation employed in coccolith zonal assignments of core samples (summarized in Figure 2) is based on Bukry, in press (a). Late Cretaceous silicoflagellates from Site 216 are shown (Plate 1).

Coccolith and Silicoflagellate Stratigraphy, Eastern Indian Ocean, Deep Sea Drilling Project, Leg 22