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Usu-b Tephra

Abbr.: Us-b

Synonym: Usu-b Pumice Bed

• Volcanic rocks
• Holocene (AD1663)

• Source: Usu volcano

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Ishikari lowland, Hokkaido

• Nakagawa et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.7, pp.473-489 DOI