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Omodani Formation

Invalid synonym: Omodani Rhyolites

• Type locality: Omodani, Ono city, Fukui prefecture
• Volcanic rocks
• Late Cretaceous
• Intruded by: Pyroxene porphyry dike
• Intruded in: Samondake Unit
• Correlation: Nohi Rhyolites

• Sedimentary facies: Sill, Dyke
• Lithofacies: Rhyolite welded tuff
• Lithofacies: Rhyolite breccia, Quartz porphyry
• Lithofacies (Minor): Wood fragments, Tuffaceous mudstone

• Thickness: 400 - 700 m or thicker
• Upper limit: Conformity (Itoo Formation)
• Lower limit: Conformity (Saruzuka Conglomerate Member), Conformity, partly Unconformity (Asuwa Group), Unconformity (Dosaiyama Conglomerate MemberSamondake Unit, Hayashitani Andesites, Higashimata Complex)

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

• Distribution: Omodani - Mount Ubagatake - Niguregawa river, Ono city, Fukui pref.; Shiraiwa valley - Nakagoshi - Mandokoro - Akaguradani valley, Kanzaki, Yamagata city, Gifu pref.; Nishigahora, Seki city, Gifu pref.; Takayadani valley, Motosu city, Gifu pref.; Mount Takinamiyama - Nonokoya, Itadori, Seki city, Gifu pref.

• Sano (2018) Jour. Geol. Soc. Japan, vol.124, no.6, pp.449-467 DOI
• Wakita (1984) Geology of the Hachiman District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 89p. (in Japanese with English abstract 6p.)
• Nozawa et al. (1975) Geology of the Hida-Furukawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 9p.)
• 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.)