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Sugisawa Tuff Breccia Member
- Type locality: Sugisawa, Kaneyama city, Mogami county, Yamagata prefecture
- Volcanic rocks
- Miocene
- Contemporaneous heterotopic facies: Hokizawa Tuff Breccia Member
- Lithofacies: Pyroxene andesite volcaniclastic rocks
- Lithofacies (Minor): Pyroxene olivine basalt volcaniclastic rocks
- Thickness: 300 m or thicker
- Lower limit: Boundary between the lower lapilli tuff dominant horizon and the upper tuff breccia dominant horizon
- Lower limit: Transitional (Akakura Tuff Member)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sugisawa - Iriariya, Kaneyama city, Mogami county, Yamagata 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.)