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Okuwabara Formation Yanagisawa et al., 1986
- Type locality: Okuwabara, Minamiuonuma city, Niigata prefecture
- Accretionary complex
- Deposition (Chert): Early Triassic? (Conodont)
- Intruded by: Tadamigawa Granites, Andesite
- Sedimentary facies: Marine
- Lithofacies: Chert
- Lithofacies (Minor): Shale, Sandstone
- Sedimentary structures: Slump structure
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Okuwabara - Takaishizawa, Minamiuonuma city, Niigata pref.; Himizo, Tokamachi city, Niigata pref.; Oike river - Mount Kamigongendo, Uonuma city, Niigata pref.
- Fossils (Conodonts): Anchignathodus sp., Diplodolella sp., Hindeodella sp., Neospathodus sp., Prioniodina (Cypridodella) sp.
- 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.)
- Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)