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Ch-a1 Miyata et al., 1988

Abbr.: Ch-a1

• Type locality: Izumikawa, Betsukai city, Notsuke county, Hokkaido
• Tephra
• Pleistocene

• Lithofacies: Scoria, Pumice, Lithic fragments

• Source: Mashu volcano
• Thickness: 10 cm?
• Upper limit: Unconformity (Ml-e)
• Lower limit: Unconformity (Ch-a2)

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

• Distribution: Izumikawa, Betsukai city, Notsuke county, Hokkaido

• Hasegawa et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.369-390 DOI