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Fukuhira Formation Imamura et al., 1951
Invalid synonym: Fukuhira Pyroclastic Rock Member
- Type locality: Fusegawa river - Tamomigawa river, Kurobe city, Toyama prefecture
- Volcanic rocks
- Volcanic island
- Miocene (16 - 12 Ma; 12.2 Ma, FT; 15.9 Ma, U-Pb)
- Intruded by: Dacite dykes
- Sedimentary facies: Marine
- Lithofacies: Andesite - Dacite lava, Volcanic breccia, Tuff breccia, Tuff, Tuffaceous sandstone, Volcanic conglomerate
- Sedimentary structures: Graded bedding, Cross stratification
- Paleocurrent: to Northwest - West
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Fusegawa river - Tamomigawa river - Kareizawa, Kurobe city, Toyama pref.; Kurotani, Katakaigawa river - Kadokawa dam - Kakuma, Uozu city, Toyama pref.; Kamiichi river - Goio - Gomado, Kamiichi city, Nakaniikawa county, Toyama pref.
- Fossils (Shellfishes): Lucinoma sp., Nuculana sp.
- Takeuchi et al. (2017) Geology of the Tomari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 121p. (in Japanese with English abstract 4p.)
- Sumi and Nozawa (1973) Geology of the Uozu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 5p.)
- Nozawa and Sakamoto (1960) Gohyakkoku, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 10p.)