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Oishigawa Lavas (Kawachi, 1974) Nishiki et al., 2007

Abbr.: OG

• Type locality: 800 m above sea level of Oishi river, Sakuho city, Minamisaku county, Nagano prefecture
• Volcanic rocks
• early Pleistocene (1.01 Ma, K-Ar)

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

• Source: Oishi river
• Eruptive volume: 0.3 km³
• Thickness (A unit): 5 - 10 m
• Intercalated in Komadeike Volcaniclastics.

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

• Distribution: 800 - 820 m above sea level, Oishi river, Sakuho city, Minamisaku county, Nagano pref.; Oishi, Sakuho city, Minaisaku 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
• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)