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Shimizubuchi Tuff Member Ozawa et al., 1979
- Type locality: Shimizubuchi, Sasago river, Chokai town, Yurihonjo city, Akita prefecture
- Volcanic rocks
- early Miocene
- Contemporaneous heterotopic facies: Upper - Middle Hatamura Formation
- Lithofacies: Biotite dacite welded tuff, Tuff, Lapilli tuff
- Hatamura Formation
- [ Upper ]
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- Upper part / Shimizubuchi Tuff Member / Zentoku Tuff Member
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- Middle part / Shimizubuchi Tuff Member
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- Lower part
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Shimizubuchi, Sasago river, Chokai town, Yurihonjo city, Akita pref.; Kabakura, Ugo city, Ogachi county, Akita pref.
- Ozawa et al. (1979) Geology of the Asamai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 53p. (in Japanese with English abstract 4p.)
- 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.)