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Lower Mashu Tephra Formation (Miyata et al., 1988) Hasegawa et al., 2009

Abbr.: Ml

• Tephra
• Pleistocene

• Source: Mashu volcano
• Upper limit: Unconformity (Upper Mashu Tephra Formation)
• Lower limit: Unconformity (Chanai Tephra Formation)

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

• Distribution: Konsen area, Hokkaido

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