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Unit 4
- Type locality: Southern Naha city, Okinawa prefecture (Original locality)
- Type locality: Querries of Mount Yoza - Mount Yaese, Itoman city, Okinawa prefecture (Reset by Nakamori, 1986)
- Coherent formation
- Coral reef complexes
- Pleistocene
- Correlation: Unit 4, Kourijima Formation
- Sedimentary facies: Marine
- Depth of water: Offshore
- Lithofacies: Algal ball limestone, Detrital limestone, Cycloclypeus-Operculina limestone
- Upper limit: Unconformity
- Lower limit: Unconformity
- Unit 4
- [ Upper ]
- ~~~~~~~~~~~~~~
- Subunit 4R
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Itoman city, Okinawa pref.
- Sagae et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.2, pp.117-136 DOI