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Younger stratovolcano
- Type locality: mountain side - summit of Mount Iwakisan, Aomori prefecture
- Volcanic rocks
- Pleistocene
- Lithofacies: Calc-alkaline series (Hypersthene series)
- Lithofacies: Hypersthene augite andesite, Olivine hypersthene augite andesite
- Lithofacies: Andesitic lava (8 flow units)
- Lithofacies (Minor): Andesitic tuff breccia, Flow breccia
- Thickness (A unit): 30 - 50 m
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: mountain side - summit of Mount Iwakisan, Aomori pref.
- Ozawa and Hirayama (1970) Geology of the Goshogawara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 25p. (in Japanese with English abstract 3p.)
- Ozawa (1962) Hirosaki, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 52p. (in Japanese with English abstract 5p.)