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Yunosawagawa Formation Ozawa et al., 1979

• Type locality: Akita prefecture
• Volcanic rocks
• Miocene
• Contemporaneous heterotopic facies: Monzen Formation, Oarasawa Formation

• Lithofacies: Andesite lava (Hyaloclastite), Tuff breccia, Volcanic breccia, Lapilli tuff
• Lithofacies (Minor): Tuff, Welded tuff
• Lithofacies (Bottom): Basal conglomerate

• Thickness: 100 - 500 m
• Upper limit: Conformity (Iizawa Formation), Unconformity (Okachigawa Formation, Sanzugawa Formation)
• Lower limit: Unconformity (Kamuroyama Granites)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Yunosawa river - Ogachi river - Ozawa - Yamanota, Innai, Yuzawa city, Akita pref.; Iwadai, Ugo city, Ogachi county, 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.)