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Kosagawa Lava

• Stratovolcano
• West Chokai edifice
• Volcanic rocks
• Pleistocene

• Lithofacies: Calc-alkaline
• Lithofacies: Hypersthene olivine augite andesite
• Lithofacies: (2 flow units)

• Thickness: 30 - 40 m
• Upper limit: Unconformity (Sand dune deposit, Kannonmori Lava)

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

• Distribution: Kosagawa - Osugo - Kawafukuro river, Kisakata town, 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.)