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Nakanomata Tuff Breccia Member
- Lithofacies: Pyroxene andesite tuff breccia
- Lithofacies (Minor): Andesite lava, Lapilli tuff, Tuff, Tuffaceous mudstone, Tuffaceous sandstone
- Lithofacies (Basal): Conglomerate
- Thickness: 350 m or thicker
- Upper limit: Boundary between the lower tuff breccia dominant horizon and the upper lapilli tuff dominant horizon
- Upper limit: Transitional (Akakura Tuff Member)
- Lower limit: Unconformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nakanomata, Mamurogawa city, Mogami county, Yamagata pref.; Mount Kamuro, Shinjo city - Kaneyama city, Mogami county, Yamagata pref.; Akinomiya, Yuzawa city, Akita pref.
- Ozawa and Sumi (1961) Uzenkaneyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 5p.)