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2. Cronin, T. M. and Ikeya, N., 1987, The Omma-Manganji ostracod fauna(Plio–Pleistocene)of Japan and the zoogeography of circumpolar species. J. Micropalaeontol., 6, 65–88.
3. Cronin, T. M., Kitamura, A., Ikeya, N., Watanebe, M. and Kamiya, T., 1994, Late Pliocene climate change at 3.4–2.3 Ma: palaeoceanographic record from the Yabuta Formation, Sea of Japan. Palaeogeogr. Palaeoclimatol. Palaeoecol., 108, 437–455.
4. 江口 明, 1988a, 新津丘陵・護摩堂山東方地域に産する有孔虫化石.新潟県地学教育研究会誌, 22, 60–63. [Eguchi, A., 1988a, Fossil foraminifers in the eastern part of the Niitsu Hills and Gomado Mountain. Res. Rep. Assoc. Earth Sci. Educ. Niigata, 22, 60–63.] English translation from the original written in Japanese.
5. 江口 明, 1988b, 新津丘陵・護摩堂山東方地域における地質と層序:有孔虫化石による検討.新潟県立教育センター研究報告, 99, 35–44. [Eguchi, A., 1988b, Geology and stratigraphy in the eastern part of the Niitsu Hills and Gomado Mountain: fossil foraminifers research. Res. Rep. Niigata Pref. Educ. Center, 99, 35–44.] English translation from the original written in Japanese.