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Otani Formation (Ozaki et al., 1954)
Invalid synonym: Otani Conglomerate Member, Oboradani Formation
- Coherent formation
- younger than Late Permian
- Limestone gravels: Early - Late Permian (Fusulinids)
- Lithofacies: Conglomerate
- Lithofacies (Minor): Limestone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Lake Kuzuryuko - Otani Akubaradani valley - Mount Washikuragatake - Nojiri - Isetoge pass, Ono city, Fukui pref.
- Fossils (Limestone gravels): Brachiopods (Favosites sp.)
- Fossils (Limestone gravels, Fusulinids): Parafusulina? sp., Pseudofusulina japonica, Triticites sp.
- Tsukada et al. (2004) Jour. Geol. Soc. Japan, vol.110, no.10, pp.640-658 DOI
- Kawai (1964) Neo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 12p.)
- Kawai et al. (1957) Arashimadake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 110p. (in Japanese with English abstract 13p.)