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Iridogawa Lava (Kawachi, 1974-75) Nishiki et al., 2007

Abbr.: ID

• Type locality: 1,400 m above sea level of Irido river, Sakuho city, Minamisaku county, Nagano prefecture
• Volcanic rocks
• early Pleistocene (1.02 Ma, K-Ar)

• Lithofacies: Orthopyroxene clinopyroxene hornblende dacite
• Lithofacies: Lava (a flow unit)

• Source: Mount Yabashira
• Eruptive volume: 0.2 km³
• Thickness (A unit): 20 m
• Upper limit: Odakegawa Lavas
• Lower limit: Yagori Volcaniclastics

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

• Distribution: 1,200 - 1,700 m above sea level, Irido river, Sakuho city, Minamisaku county, Nagano pref.

• Nishiki and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.8, pp.499-515 DOI
• Nishiki et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.5, pp.193-211 DOI