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Otaki Formation
- Type locality: Otaki, Tarui city, Fuwa county, Gifu prefecture
- Accretionary complex
- Deposition (Limestone): Carboniferous (Fusulinids)
- Jurassic
- Intruded by: Porphyrite dyke
- Sedimentary facies: Marine
- Lithofacies: Slate
- Lithofacies (Minor): Greenstone, Limestone, Sandstone, Chert
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Otaki - Oishi, Tarui city, Fuwa county, Gifu pref.; Noharadani valley - Tani, Ibigawa city, Ibi county, Gifu pref.
- Fossils (Limestone): Chaetetes sp., Stromatoporoids, Bryozoans
- Fossils (Limestone, Fusulinids): Fusulinella biconica, Schwagerina sp.
- Fossils (Limestone, Corals): Clisaxophyllum awa, Lithostrotion cf. somaense, Nagatophyllum satoi
- Isomi (1956) Ominagahama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 51p. (in Japanese with English abstract 6p.)
- Isomi (1955) Ogaki, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 24p. (in Japanese with English abstract 6p.)