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Menaichizawa Formation
- Volcanic rocks
- Continental margin volcanism
- middle Miocene
- Sedimentary facies: Terrestrial, Marine
- Depth of water: Shallow
- Lithofacies (Upper): Basaltic andesite lava, Basaltic andesite pyroclastic rocks, Basaltic andesite tuffaceous sandstone, Dacitic pumice tuff, Dacitic welded tuff
- Lithofacies (Lower): Basaltic andesite pyroclastic rocks
- Lithofacies (Lower, Minor): Mudstone, Sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hokuroku district, Akita pref.
- Distribution: Kosaka city, Kazuno county, Akita pref.
- Yamada and Yoshida (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.168-179 DOI
- Mizuta and Ishiyama (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, p.181 DOI