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Stage 1

• Type locality: Oshima-Kojima island, Hokkaido
• Volcanic rocks
• Pleistocene

• Sedimentary facies: Marine, Terrestrial
• Lithofacies: Andesite, Dacite, Pyroclastic rocks

• Source: Northwest of Oshima-Kojima island

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

• Distribution: Oshima-Kojima island, Hokkaido

• Kosugi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.12, pp.743-758 DOI