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Otakidani Formation
- Type locality: Otaki valley, Itoigawa city, Niigata prefecture
- Coherent formation
- Early Jurassic, Toarcian (Ammonoids)
- Sedimentary facies: Marine
- Lithofacies (Upper, Main): Mudstone
- Lithofacies (Upper, Minor): Sandstone, Conglomerate
- Lithofacies (Lower, Main): Conglomerate, Sandstone
- Lithofacies (Lower, Minor): Sandy mudstone
- Upper limit: Unknown
- Lower limit: Conformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Otaki valley, Itoigawa city, Niigata pref.
- Fossils: Ammonoids
- Takeuchi et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.7, pp.193-216, DOI