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Oishi Formation
- Type locality: Gifu prefecture
- Accretionary complex
- Deposition (Limestone): Carboniferous, Permian (Fusulinids)
- Jurassic
- Intruded by: Plagiophyre dike, Porphyrite dike
- Sedimentary facies: Marine
- Lithofacies: Slate-dominant interbedded slate and sandstone
- Lithofacies (Minor): Limestone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Oishi - Otaki, Tarui city, Fuwa county, Gifu pref.
- Fossils (Limestone): Pseudofusulina cf. ambigua, Pseudofusulina vulgaris var. globosa, Schwagerina cf. gregaria, Schwagerina krotowi, Staffella rotunda, Triticites sp.
- 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.)