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- Type locality: Nakasai, Miyamori town, Tono city, Iwate prefecture
- Coherent formation
- Lithofacies: Andesitic tuff breccia, Tuff, Calcareous - siliceous slate, Limestone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nakasai - Wakumizu, Miyamori town, Tono city, Iwate pref.
- Fossils: Crinoids, Bryozoans
- Hirokawa and Yoshida (1956) Ohazama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 31p. (in Japanese with English abstract 9p.)