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A number of palynological surveys have been made on the deep-sea sediments around the Japanese archipelago, but the samples reported here are the first to be collected from the sedimentary rocks in the ocean east of the Ryukyu island chain. Two sets of samples were analyzed, one from DSDP Site 445 and the other from Site 446 (Figure 1). Drilling at Sites 445 and 446, on the Daito Ridge and in the Daito Basin, penetrated to depths of 892 and 629 meters below the sea floor, respectively (Figure 2). Oligocene and upper Eocene at Site 445 are composed of limestone and calcareous mudstone, and the middle Eocene is composed of mudstone and sandy mudstone. The lower middle Eocene at Site 446 consists mostly of alternations of claystone and sandstone, and the Oligocene consists of ashy clays. A preliminary palynological study was made on samples from cores collected below 410 m at Site 445 and between 86 m and 365 m at Site 446 (Table 1).

Palynological Study of Paleogene Sediments from Deep Sea Drilling Project Sites 445 and 446, Philippine Sea