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Shikotsu-1 Tephra

Abbr.: Spfa-1

Synonym: Shikotsu-1 Pumice Bed

• Volcanic rocks
• Caldera forming eruptions
• Pleistocene (45.5 cal ka BP, AMS; 44.8 - 36.6 ka BP, LSC; 40.1 - 39.5 ka, ¹⁸O)
• Contemporaneous heterotopic facies: Shikotsu Pyroclastic Flow Deposit

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

• Distribution: east Tohoku region, Honshu - Hokkaido island, Japan
• Distribution: Lake Shikotsu, Chitose city, Hokkaido
• Distribution: Misawa, Tomakomai city, Hokkaido; Hayakita-Tomioka - Hayakita-Mizuho, Abira city, Yufutsu county, Hokkaido; Horosato - Kowa, Atsuma city, Yufutsu county, Hokkaido

• Okuno (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.41-53 DOI
• Nakagawa et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.7, pp.473-489 DOI