Smaller Foraminifera from Miyako-jima, Ryukyu

• Main Author: Huang Tunyow
• Format: Report
• Language: English
• Published: Tohoku University 1968
• Subjects: Planktonic foraminifera
• Online Access: http://hdl.handle.net/10097/28802; https://tohoku.repo.nii.ac.jp/?action=repository_uri&item_id=11999; https://tohoku.repo.nii.ac.jp/?action=repository_action_common_download&item_id=11999&item_no=1&attribute_id=18&file_no=1

The Foraminifera from the so-called Shimajiri Formation of Miyako-jima has been classified into 28 families, 62 genera, and 128 species and subspecies. In general, the Miyako foraminiferal assemblage is a deep-water fauna of the outer shelf area. The sampled formation is judged to be Pliocene in age from the planktonic Foraminifera. All the foraminifers were collected from beds stratigraphically below those exposed on Kikai-jima. The population of benthonic Foraminifera shows some affinity with the fauna from the Somachi Formation of Kikai-jima, Japan and with the fauna from the younger Tertiary formations in southern Taiwan (Huang, 1960) and the eastern coastal range of Taiwan (Huang, 1964). The planktonic foraminiferal fauna is correlative with the Nobori fauna of Shikoku, Japan. The Yonahama fauna appears to be referable to Banner and Blow's Zone N. 20, and the Nagama is correlated with basal Zone N. 21, based on the simultaneous appearance of Globorotalia tosaensis. Thus, the formation on Miyako-jima in this study is considered to be older than the Somachi Formation of Kikai-jima, Japan (Huang, 1966).