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Central cone
- Type locality: summit of Mount Iwakisan, Aomori prefecture
- Volcanic rocks
- Pleistocene
- Lithofacies: Calc-alkaline series (Hypersthene series)
- Lithofacies: Quartz olivine hornblende-bearing hypersthene augite andesite
- Lithofacies: Andesite lava
- Distribution: 800 x 550 m2
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: 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.)