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Ishihagegawa Volcanic Rocks

Invalid synonym: Ishihagegawa Lava

• Stratovolcano
• Old edifice
• Volcanic rocks
• Pleistocene

• Lithofacies: Calc-alkaline
• Lithofacies: Hypersthene-bearing olivine augite andesite
• Lithofacies (Minor): Hypersthene augite andesite
• Lithofacies: Andesite lava (more than 9 flow units), Tuff, Lapilli tuff, Tuff breccia

• Thickness (Overall): 100 m or thicker
• Thickness (A unit): 1- 10 m
• Lower limit: Unconformity (Tentokuji Formation)

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

• Distribution: Ishihage river - Akagawa river, Nikaho city, Akita pref.

• Nakano and Tsuchiya (1992) Geology of the Chokaisan and Fukura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 138p. (in Japanese with English abstract 7p.)