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Lower Yabitsugawa Lava

• Stratovolcano
• Old edifice
• Volcanic rocks
• Pleistocene

• Lithofacies: Calc-alkaline
• Lithofacies: Hypersthene augite andesite
• Lithofacies: Large plagioclase phenocrysts bearing
• Lithofacies: Lava (more than 5 flow units)

• Thickness: 100 m or thicker
• Upper limit: Unconformity (Upper Yabitsugawa Lava, Upper Nasodani Lava, Torinoumi Lava, Senjadani Lava)
• Lower limit: Unconformity (Mitaki Volcanic Rocks, Torigoegawa Lava)

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

• Distribution: Karafuki-Nagamine, Kisakata, Nikaho city, Akita pref.; Naso 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.)