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Arakigawa Formation Isomi and Nozawa, 1957
A part is separated as Tandodani Formation
- Type locality: Arakigawa river, Nyukawa town, Takayama city, Gifu prefecture
- Volcanic rocks
- Carboniferous, Visean
- Contemporaneous heterotopic facies: Kamihirose Formation
- Correlation: Konogidani Formation
- Lithofacies: Green schist, Basalt - andesite lava, Volcaniclastic rocks
- Lithofacies (Minor): Mudstone, Sandstone, Conglomerate, Felsic tuff, Limestone
- Lithofacies (Upper): Felsic tuff dominant
- Lithofacies (Lower): Mafic tuff dominant
- Sedimentary structures: Schistose
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Arakigawa river - Shimobo - Oshikiji - Sannose, Nyukawa town, Takayama city, Gifu pref.; Hongo - Kurabashiragawa river, Kamitakara town, Takayama city, Gifu pref.; Matsumoto town, Takayama city, Gifu pref.
- Fossils (Limestone): Brachiopods, Corals (Kueichouphyllum sp.?)
- Fossils (Lower): Ammonoids (Goniatites sp.), Trilobites (Paladin hidensis)
- Suzuki et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.4, pp.307-322 DOI
- Yamada et al. (1985) Geology of the Takayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 9p.)
- Isomi and Nozawa (1957) Funatsu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 43p. (in Japanese with English abstract 8p.)