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Kusatsugawa Debris Avalanche Deposit

• Stratovolcano
• Old edifice
• Coherent formation
• Pleistocene

• Lithofacies: Debris avalanche deposit
• Lithofacies: Blocks are mainly from Horaisan Volcanic Rocks.

• Upper limit: Unconformity (Odaino Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Maruyama Formation, Kannonji Formation)

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

• Distribution: Kusatsu river, Sakata city, 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.)