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N1 Formation
- Coherent formation
- late Triassic, Carnian
- Sedimentary facies: Shallow marine
- Lithofacies: Interbedded sandstone and shale
- Thickness: 200 m or thinner
- Upper limit: Conformity (N2 Formation)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nabae, Takahama city, Oi county, Fukui pref.
- Igi et al. (1961) Maizuru, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 49p. (in Japanese with English abstract 9p.)
- Hirokawa et al. (1958) Obama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 31p. (in Japanese with English abstract 8p.)