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Sarakawa Formation Inoue et al., 1966
- Type locality: Ashinobe creek, Sarakawa, Chokai town, Yurihonjo city, Akita prefecture
- Volcanic rocks
- Miocene
- Contemporaneous heterotopic facies: Okachigawa Formation, Iizawa Formation
- Intruded by: Dolerite
- Lithofacies: Pyroxene andesite tuff breccia, Lapilli tuff
- Lithofacies (Minor): Pyroxene andesite lava (Hyaloclastite), Volcanic breccia, Dacite lava, Acidic tuff, Lapilli tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sarakawa - Nishikume - Kiridome, Chokai town, Yurihonjo city, Akita pref.
- Ozawa et al. (1979) Geology of the Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 64p. (in Japanese with English abstract 4p.)