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Ru
- Type locality: Hidakagawa city, Hidaka county, Wakayama prefecture
- Accretionary complex
- Late Cretaceous
- Correlation: top Ra, Rb, Rc, R1
- Correlation (Upper): lower R3, R5
- Correlation (Lower): R2, R4
- Sedimentary facies: Marine
- Ryujin Formation (Hidakagawa, Wakayama pref.)
- [ Upper ]
- /--/--/--/--/-
- Ru = Ra, Rb, Rc
- /--/--/--/--/-
- Rm = upper Ra
- /--/--/--/--/-
- Rl = lower Ra
- /--/--/--/--/-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hidakagawa city, Hidaka county, Wakayama pref.
- Tokiwa et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.6, pp.270-273 DOI