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Unit 1
- Volcanic rocks
- late Pleistocene (ca. 90 ka)
- Sedimentary facies: Ground layer at the bottom of the pyroclastic flow deposit
- Lithofacies: Pebble accidental fragments
- Lithofacies (Minor): Pumice
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mashiki city, Kamimashiki county, Kumamoto pref.
- Nakazawa et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.5, pp.347-359 DOI