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Higher IV Terrace Deposit

• Coherent formation
• middle Pleistocene
• Older than Shirayukigawa Debris Avalanche Deposit.

• Lithofacies: Gravels

• Thickness: ca. 5 m
• Upper limit: Unconformity (Okuyama Debris Avalanche Deposits, Mitake Mudflow Deposits)

• Distribution: Koyoshi river, Higashiayukawa - Yashima, Yurihonjo city, Akita pref.; Ishizawa river, Yagyu - Ouchi - Okoto, Yurihonjo city, Akita pref.

• Ozawa et al. (1988) Geology of the Yashima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 87p. (in Japanese with English abstract 5p.)