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Osaraugawa Tephra

Abbr.: Osr

• Volcanic rocks
• Pleistocene

• Source: Toya volcano
• Upper limit: Unconformity (Kaminagawa Formation, Toya Pyroclastic Flow Deposit)

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

• Distribution: Osaru river, Iburi region, Hokkaido; Ishikari lowland, Hokkaido

• Nakagawa et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.7, pp.473-489 DOI
• Ganzawa et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.9, pp.470-478 DOI