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Koyoshigawa Debris Avalanche Deposit

• Coherent formation
• Holocene

• Lithofacies: Debris avalanche deposit

• Thickness: ca. 10 m
• Upper limit: Unconformity (River bed deposit)

• Distribution: Koyoshi river, Sarukura, 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.)