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Yamauchi Formation Hatakeyama, 1954
- Type locality: Takase river - Ishizawa river, Oyana - Yamauchi, Yurihonjo city, Akita prefecture
- Volcanic rocks
- Oligocene - early Miocene
- Correlation: Monzen Formation, Oarasawa Formation
- Lithofacies: Hyaloclastite
- Lithofacies: Altered pyroxene andesite lava, Volcanic breccia, Tuff breccia, Lapilli tuff
- Lithofacies (Minor): Tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Takase river - Ishizawa river, Oyana - Yamauchi, Yurihonjo city, Akita pref.
- Nishikawa et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.75-85 DOI
- Ozawa et al. (1988) Geology of the Yashima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 87p. (in Japanese with English abstract 5p.)
- Ozawa et al. (1977) Geology of the Honjo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 4p.)