Author: Marita, R., Titova, L.V., & Akiba, F., 1996.:
Title: Oligocene-Early Miocene molluscs and diatoms from the Kitama-Tsubetsu area, Eastern Hokkaido, Jaoan.
Description: Sci. Rep. Tohoku Univ., Ser. 2 (Geol.), 63(2): pp. 53-213, numerous photos on 12 plates, 2 fold. tabs. and 3 fold. diagrs. in pocket, 16 figs., refs. Ogir. wrappers.

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