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Yaemonzawa Lava Harayama, 1990
- Type locality: Mount Roppyakuzan - Yaemonzawa creek, Azumi, Matsumoto city, Nagano prefecture
- Volcanic rocks
- early Pleistocene
- Lithofacies: Pyroxene andesite lava
- Lithofacies (Minor): Andesite welded tuff, Breccia
- Sedimentary structures (Minor): Autobrecciated
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Roppyakuyama - Yaemonzawa creek - Senjozawa creek - Lake Taishoike - Nakahatazawa creek - Mount Nishihotakadake, Azumi, Matsumoto city, Nagano pref.
- Harayama et al. (1991) Geology of the Yarigatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 190p. (in Japanese with English abstract 8p.)
- Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)