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Usu volcano
- Type locality: Mount Usu, Toyako city, Abuta county, Hokkaido
- Volcanic rocks
- Pleistocene - Holocene (20 - 0.0 ka)
- Usu volcano
- [ Upper ]
- ~~~~~~~~~~~~~~
- Usu-b Tephra
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Usu, Toyako city, Abuta county, Hokkaido
- Nakagawa et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.7, pp.473-489 DOI