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Ushiwatarigawa Lava

Invalid synonym: Shukumachi Pyroclastic Flow Deposit

• Stratovolcano
• West Chokai edifice
• Volcanic rocks
• Pleistocene

• Lithofacies: Calc-alkaline
• Lithofacies: Hornblende hypersthene olivine augite andesite
• Lithofacies: Lava

• Thickness: 20 - 30 m
• Upper limit: Unconformity (Fukura Lava, Minowa Lava)

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

• Distribution: Ushiwatari river, Yuza city, Akumi county, Yamagata 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.)