Fukuta, O., 1962: Eocene foraminifera from the Kyoragi Beds in Shimo-shima, Amakusa Islands, Kumamoto Prefecture, Kyushu, Japan. Report of the Geological Survey of Japan, no. 194, p. 1–31.
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Fukuta, O., 1962: Eocene foraminifera from the Kyoragi Beds in Shimo-shima, Amakusa Islands, Kumamoto Prefecture, Kyushu, Japan. Report of the Geological Survey of Japan, no. 194, p. 1–31