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Oikkui Formation
- Coherent formation
- Late Triassic, Norian
- Sedimentary facies: Very shallow marine
- Depth of water: Several - a dozen m
- Lithofacies: Interbedded sandstone and shale
- Lithofacies (Minor): Limestone, Calcareous shale
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Oikkui - Fukazawa - Tnago-kobora - Tango creek, Tone river, Minakami city, Tone county, Gunma pref.
- Fossils (Upper): Shellfishes (Sarakai-type)
- Fossils (Lower): Crinoids
- Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)