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Sanjiro Volcaniclastics (Tanaka and Hirabayashi, 1963) Mukai et al., 2009

Invalid synonym: Sanjiro Tuff, Sanjiro Tuff Breccia

• Type locality: 1,250 m above sea level of Daimon creek, Matsumoto city, Nagano pref.
• Volcanic rocks
• Pleistocene

• Lithofacies: Reworked pumice flow deposit, Debris flow deposit
• Lithofacies: Tuffaceous sandstone - siltstone, Tuff, Tuff breccia

• Eruptive volume: 1.12 km³
• Thickness (Daimon creek): ca. 300 m
• Thickness (Yateikura creek): ca. 10 m
• Upper limit: Unconformity (Tobiratoge Volcaniclastics, Nakayamasawa Lava)
• Lower limit: Interfingered (Yateikurasawa Lavas), Unconformity (Uchimura Formation, Kotakiyama Group)

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

• Distribution: Sanjiro region, Matsumoto city, Nagano pref.; 1,200 - 1,500 m above sea level of Daimon creek, Matsumoto city, Nagano pref.; 1,300 - 1,450 m above sea level of Yateikura creek, Nagawa city, Chiisagata county, Nagano pref.

• Mukai et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.400-422 DOI