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Nishikyo Formation (Tomizawa, 1953) Nakano et al., 2002
Invalid synonym: Nishikyo Mudstone Member
It had been treated as a member of Aoki Formation.
- Type locality: Nishikyo, Kinasa, Nagano city, Nagano prefecture
- Coherent formation
- late Miocene
- Correlation: Aoki Formation, Nakagomi Formation
- Sedimentary facies: Marine
- Sedimentary facies (Minor): Turbidite
- Lithofacies: Mudstone
- Lithofacies (Minor): Sandstone, Interbedded sandstone and mudstone
- Sedimentary structures (Minor): Graded bedding, Sole mark, Parallel stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nishikyo - Hodai - Komaki - Fukatanisawa creek, Kinasa, Nagano city, Nagano pref.; Kaguraoka - Mochigyo, Ogawa city, Kamiminochi county, Nagano pref.
- Tanabe (2015) Jour. Geol. Soc. Japan, vol.121, no.8, pp.265-278, DOI
- Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)
- Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)