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Iozen Formation Fujita and Nakagawa, 1948
- Type locality: Mount Iozen, Nanto city, Toyama prefecture
- Volcanic rocks
- Miocene (17.2 Ma, FT)
- Intruded by: Basalt dikes
- Contemporaneous heterotopic facies (Upper - Middle): Muromaki Conglomerate Member
- Sedimentary facies (Lower): Marine
- Lithofacies (Top): Pitchstone
- Lithofacies: Rhyolite lava, Pumiceous tuff breccia, Pumiceous tuff
- Lithofacies (Upper, Minor): Volcanic conglomerate, Tuffaceous siltstone, Sandstone
- Lithofacies (Lower, Minor): Dacite lava, Pillow lava
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Iozen, Nanto city, Toyama pref.; Shogawa river - Komaki dam - Muromaki river, Tonami city, Toyama pref.; Jinpugawagawa river - Yamadagawa river, Toyama city, Toyama pref.; Mount Kurotakiyama, Kanazawa city, Ishikawa pref.
- Nakajima et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.7, pp.483-516 DOI
- Kunugiza et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.83-101 DOI
- Inoue et al. (1964) Johana, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 5p.)
- Sakamoto and Nozawa (1960) Yatsuo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 8p.)