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Onnaiwa Lava
- Type locality: Onnaiwa, Mount Kayagatake, Nirasaki city, Yamanashi prefecture
- Volcanic rocks
- early Pleistocene
- Lithofacies: Hypersthene augite andesite lava
- Lithofacies (Basal): Volcanic breccia
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Onnaiwa, Mount Kayagatake, Nirasaki city, Yamanashi pref.
- Mimura et al. (1984) Geology of the Mitake-Shosenkyo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 61p. (in Japanese with English abstract 4p.)