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Unit 4

• Type locality: Kouri island, Okinawa prefecture
• Coherent formation
• Coral reef complexes
• Pleistocene, (0.85 - 0.45 Ma, Calcareous nannofossils)
• Correlation: Unit 4, Naha Formation

• Sedimentary facies: Marine

• Upper limit: Unconformity
• Lower limit: Unconformity

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Kouri island, Okinawa pref.

• Sagae et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.2, pp.117-136 DOI