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Byobuiwa Lavas
- Type locality: Nagano prefecture
- Volcanic rocks
- early Pleistocene (0.88 Ma, K-Ar)
- Lithofacies: Hypersthene augite andesite
- Lithofacies: Lavas (4 flow units), Pyroclastic rocks
- Source: Mount Futago
- Eruptive volume: 1.8 km3
- Thickness (Overall): 20 - 180 m
- Thickness (A unit): 20 - 35 m
- Upper limit: Unconformity (Hosokojigawa Lava)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: 1,200 - 2,050 m above sea level, east slope of Mount Futago, Saku city, Nagano pref.
- Nishiki and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.8, pp.499-515 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.)