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Ryukyu Group MacNeil, 1960
- Type locality: Takao, Taiwan
- Coherent formation
- Coral reef complex
- Upper: Pleistocene (137 - 40 ka)
- Lower: Pleistocene (older than 0.45 Ma, U, ESR)
- Miyako island: Pleistocene (0.95 - 0.41 Ma, Calcareous nannofossil)
- Sedimentary facies: Marine
- Depth of water: Continental shelf
- Lithofacies (Upper): Coral limestone, Algal ball limestone, Cycloclypeus-Operculina limestone, Bioclastic limestone
- Lithofacies (Middle): Coral limestone, Algal ball limestone, Cycloclypeus-Operculina limestone, Bioclastic limestone
- Lithofaceis (Minor): Gravelly limestone, Calcareous conglomerate
- Yomitan, Okinawa pref.
- [ Upper ]
- ~~~~~~~~~~~~~~
- Sobe Formation
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- [ Lower ]
- Katsuren peninsula, Okinawa pref.
- [ Upper ]
- ~~~~~~~~~~~~~~
- Yokatsu Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
- Kouri island, Okinawa pref.
- [ Upper ]
- ~~~~~~~~~~~~~~
- Kourijima Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
- Ishigaki island, Okinawa pref.
- [ Upper ]
- ~~~~~~~~~~~~~~
- Ohama Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
- Ryukyu Group
- [ Upper ]
- ~~~~~~~~~~~~~~
- Upper Ryukyu Group
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- Middle Ryukyu Group
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Taiwan - Ryukyu islands - Kikai island
- Distribution: Hyakunodai - Isaneku - Kamikatetsu, Kikai island, Kagoshima pref.
- Fossils (Coral): Amphistegina spp., Calcarina spp., Heterostegina sp.
- Fossils: Foraminifera, Algal ball, Bryozoans
- Anai et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.12, pp.1035-1048 DOI
- Nanjo et al. (2013) Jour. Geol. Soc. Japan, vol.119 no.3, pp.155-170 DOI
- Sagae et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.2, pp.117-136 DOI
- Yamada et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.1, pp.19-22 DOI