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Unit 3

Invalid synonym: Oyatsu white pumice flow deposit, Aso-4A

• Volcanic rocks
• late Pleistocene (ca. 90 ka)

• Lithofacies: Pumiceous volcanic sand
• Lithofacies (Minor): Pebble pumice, Sand-pebble accidental fragments

• Source: Aso caldera

------ 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