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Kayashiba Formation
- Volcanic rocks
- Miocene (ca. 12 - 11 Ma)
- Lithofacies: Rhyolitic feeder dyke, Rhyolitic hyaloclastite
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Otaru city, Hokkaido
- Nishina et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.5, pp.387-402 DOI