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Ukibuta Basalt Member (Kato, 1955) Kutsuzawa, 1963
Invalid synonym: Ukibuta Basalts
- Type locality: Mizusawa, Omonogawa town, Yokote city, Akita prefecture
- Volcanic rocks
- middle Miocene
- Contemporaneous heterotopic facies: Lower Sugota Formation
- Lithofacies: Olivine basalt lava (Hyaloclastite, Pillow lava), Agglomerate, Volcanic breccia, Tuff breccia
- Lithofacies (Minor): Olivine basalt lapilli tuff, Sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mizusawa, Omonogawa town, Yokote city, Akita pref.; Iwaizawa, Higashiyuri, Yurihonjo city, 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.)