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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