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Stage I

• Type locality: Mount Komagatake, Hokkaido
• Volcanic rocks
• late Pleistocene (? - 39 ka)

• Lithofacies: Pumice fall deposit, Volcanic ash fall deposit, Pyroclastic flow deposit, Lava, Debris avalanche

• Mode of eruption: Plinian associated with pyroclastic flows
• Upper limit: Unconformity (Stage II)

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

• Distribution: Mount Komagatake, Hokkaido

• Yoshimoto et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.7, pp.336-347 DOI