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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 dykes
• 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

• Thickness: ca. 75 - 1,000 m
• Upper limit: Transitional (Kurosedani Formation, Sunagozaka Formation), Unconformity (Udatsuyama Formation, Muromaki Conglomerate Member)
• Lower limit: Conformity (Iwaine Formation)

------ 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.)