Field logs of Paleogene sediments in Sakito-Oshima and Amakusa-Shimoshima areas, northwestern Kyushu, Southwest Japan

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This article reports field observation of Paleogene clastic successions in two areas in north-western Kyushu and provides a preliminary interpretation of their sedimentary environments on the basis of lithological facies. In the sections from Sakito-Oshima Island, the Ichigoshima, Sakito, Maze and Tokuman Formations were logged. They are, except their basal part, interpreted to represent an overall transgression from fluvial, estuarine, shelf, and then to deep marine environments during the latest Eocene to Early Oligocene. A sedimentary cycle of a Middle Eocene age from nonmarine, to deep marine, and then to shallow marine environments was able to be reconstructed from the observation in the sections from the Amakusa-Shimoshima area, where the Fukuregi, Shikiyama and Toishi Formations were examined. These evidence will be adapted in the interpretation of fossil dinoflagellate cysts and molluscs which is the principal intent of the present project.
新潟大学の論文