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- Type locality: Kitanomata river, Hachimantai city, Iwate prefecture
- Volcanic rocks
- Correlation: Hashiba Formation
- Lithofacies: Tuff, Tuffaceous mudstone
- Distribution: Kitanomata river, Hachimantai city, Iwate pref.
- Kawano and Uemura (1964) Hachimantai, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 36p. (in Japanese with English abstract 8p.)