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Nishitani Formation (Kawai, 1956) Nakae et al., 2013

Invalid synonym: Nishitani Rhyolite

• Type locality: Suhara, Ono city (ex. Nishitani city), Fukui prefecture
• Volcanic rocks
• middle Miocene (ca. 22 Ma; 27.2, 24.5, 22.3, 22.0, 21.7 Ma, FT)
• Intruded by: Nogohakusan Granodiorite

• Lithofacies (Upper): Biotite-bearing rhyolite welded tuff, Tuff
• Lithofacies (Lower): Conglomerate
• Lithofacies (Lower, Minor): Sandstone, Siltstone

• Thickness: ca. 40 - 380 m or thicker
• Upper limit: Unconformity (Itoo Formation)
• Lower limit: Unconformity (Higashimata Complex, Mino Belt)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Kokonogi - Mohara, Echizen city, Nyu county, Fukui pref.; Oizu town, Echizen city, Fukui pref.; Kaburagi - Mount Yarasudake - Kono, Minamiechizen city, Nanjo county, Fukui pref.; Mount Ubagatake - Suhara - Mount Kuranomatayama - Shiratani valley - Heikedaira, Ono city, Fukui pref.; Suizu, Tsuruga city, Fukui pref.; Isondani valley, Ibigawa city, Ibi county, Gifu pref.

• Nakae et al. (2015) Geology of the Kanmuri Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 107p. (in Japanese with English abstract 3p.)
• Nakae et al. (2013) Geology of the Imajo and Takenami District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)
• Kano et al. (2007) Geology of the Fukui District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 68p.
• Kawai (1964) Neo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 12p.)
• Kawai et al. (1957) Arashimadake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 110p. (in Japanese with English abstract 13p.)