Older stratovolcano

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Older stratovolcano

Volcanic rocks
Pleistocene

Lithofacies: Calc-alkaline series (Hypersthene series)
Lithofacies: Hypersthene augite andesite
Lithofacies: Andesitic tuff breccia
Lithofacies (Minor): Andesitic volcanic breccia, Lapilli tuff, Tuff, Flow breccia

Iwakisan volcano
[ Upper ]
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Iwakisan Volcaniclastic Rocks
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Central cone
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Parasitic cone
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Younger stratovolcano
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Older stratovolcano
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[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Kuronbo pond, Tokumei river, Ajigasawa city, Nishitsugaru county, 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.)