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Akada Formation
- Type locality: Akada, Nohara, Arao city, Kumamoto prefecture
- Coherent formation
- Pleistocene
- Sedimentary facies: Terrestrial
- Lithofacies: Sand, Gravel
- Lower limit: Conformity (Humic sand)
- [ Upper ]
- ?--?--?--?--?-
- Akada Formation
- --------------
- Nagasu Formation
- ?--?--?--?--?-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Arao city - Nagasu city, Kumamoto pref.
- Shimoyama et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.11, pp.709-722 DOI