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Oishigawa-futamata Lavas Nishiki et al., 2007

Abbr.: OF

• Type locality: 1,850 m above sea level, Oishi river, Sakuho city, Minamisaku county, Nagano prefecture
• Volcanic rocks
• early Pleistocene (1.04 Ma, K-Ar)

• Lithofacies: Olivine-bearing orthopyroxene clinopyroxene basaltic andesite
• Lithofacies: Lavas (more than 2 flow units), Pyroclastic rocks

• Source: Mount Kengamine
• Eruptive volume: 0.6 km³ or more
• Thickness (A unit): 5 - 10 m
• Upper limit: Yachiho-kogen Lavas, Shirakoma-rindo Lava

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

• Distribution: 1,800 - 1,870 m above sea level, Oishi 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