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Chiyosato-bokujo Lavas Kawachi, 1974-75

Abbr.: CB

• Type locality: 1,350 m above sea level of Oishi river, Sakuho city, Minamisaku county, Nagano prefecture
• Volcanic rocks
• early Pleistocene (0.83 Ma, K-Ar)

• Lithofacies: Orthopyroxene olivine clinopyroxene basaltic andesite
• Lithofacies: Lavas (more than 2 flow units)

• Source: Oishi river
• Eruptive volume: 1.4 km³
• Thickness (A unit): ca. 10 m
• Upper limit: Kengamine Pyroclastics
• Lower limit: Kengamine-east Lavas, Komadeike Volcaniclastics

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

• Distribution: 1,350 m above sea level, Oishi river, Sakuho city - Arakura river - Chiyosato farm, Koumi 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
• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)