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Chiyosato Lava Kawachi, 1974
Abbr.: CY
- Type locality: 850 m above sea level of Honmashita, Koumi city, Minamisaku county, Nagano prefecture
- Volcanic rocks
- early Pleistocene (1.01 Ma, K-Ar)
- Lithofacies: Orthopyroxene-bearing olivine clinopyrocene basalt
- Lithofacies: Lava (a flow unit)
- Source: Oishi river
- Eruptive volume: 0.2 km3
- Thickness: 15 m or thicker
- Thickness (A unit): ca. 10 m
- Intercalated in Komadeike Volcaniclastics.
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Honmashita, 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.)