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Uyashinai Mudstone Member (Kawai, 1949) Kutsuzawa et al., 1966
Invalid synonym: Uyashinai Formation
- Type locality: Uyashinai, Kawabe, Akita city, Akita prefecture
- Coherent formation
- Miocene
- Contemporaneous heterotopic facies: Upper Main part
- Lithofacies: Mudstone
- Lithofacies (Minor): Basalt pyroclastic rocks, Acidic tuff
- Sunakobuchi Formation
- [ Upper ]
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- Uyashinai Mudstone Member
- '''''''/,,,,,,
- Main part
- '''''''/,,,,,,
- Shonai Tuff Member
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Uyashinai - Senno valley - Koide creek, Kawabe, Akita city, Akita pref.; Shonai, Kyowa, Daisen city, Akita pref.
- Fossils: Foraminifera
- Ozawa et al. (1981) Geology of the Taiheizan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 4p.)