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Ko-i Tephra (Katsui et al., 1989) Karisawa et al., 1992

Abbr.: Ko-i

Invalid synonym: Ko-h2

• Type locality: Mount Komagatake, Hokkaido
• Tephra
• late Pleistocene (39 cal ka, ¹⁴C)

• Lithofacies: Pumice fall deposit, Pyroclastic flow deposit

• Mode of eruption: Plinian
• Eruptive volume: 0.3 km³ DRE or more
• Thickness (Pyroclastic flow deposit): 10 m
• Lower limit: Unconformity (Numajiri Debris Avalanche Deposit)

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

• Distribution: East flank of Mount Komagatake, Hokkaido; Kameda peninsula, Hokkaido; Shirinashi river, Shikabe city, Kayabe county, Hokkaido

• Yoshimoto et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.7, pp.336-347 DOI
• Yoshimoto et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.81-92 DOI