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Chosui Lava Hayatsu, 1972
- Type locality: Chosui, Shinano city, Kamiminochi county, Nagano prefecture
- Volcanic rocks
- Stratovolcano
- Pleistocene
- Lithofacies: Lava (2 flow units)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Chosui - Yagen creek - Otaki creek, Shinano city, Kamiminochi county, Nagano pref.
- Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)