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Shimotamatagawa Lava (Hayashi, 1984) Nakano and Tsuchiya, 1992

• Stratovolcano
• Old edifice
• Volcanic rocks
• Pleistocene

• Lithofacies: Calc-alkaline
• Lithofacies: Hypersthene-bearing olivine augite basalt
• Lithofacies: Lava (A flow unit)

• Thickness: 8 - 20 m or thicker
• Upper limit: Unconformity (Upper Shimotamatagawa Lava)

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

• Distribution: Shimotamata river - Shunomata river, Chokai town, Yurihonjo 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.)