Microfossils of the core sample GDP-11-15 from the Amami Plateau, the northern margin of the Philippines Sea

Abstract

The micropaleontological studies of a gravity core taken from a depth of 1, 830 m on the Amami Plateau, situated at the northern margin of the Philippine Sea, have revealed a presence of hiatus between the late Pliocene and the late Pleistocene sediments. Furthermore, the conspicuous difference in the water depths of the accumulation of sediments is recognized between the portions above and below the hiatus. Consequently, it is considered that the plateau submerged with the amount of about 1, 000 m during the latest Pliocene and early Pleistocene. Lastly two foraminiferal species are described: Globocassidulina ikebei and Pleurostomella delicata.