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Lower I Terrace Deposit

• Coherent formation
• Pleistocene (34,900 - 27,800 yBP, ¹⁴C)

• Sedimentary facies: Terrace deposit
• Lithofacies: Gravels, Sands, Mud

• Thickness: 10 m or thinner
• Upper limit: Conformity (Weathered volcanic ash)

• Distribution: Shinjo basin, Yamagata pref.
• Distribution: Takasaka - Ijosawa - Rengejo, Mamurogawa city, Mogami county, Yamagata pref.; Iwaki - Kinone - Marumori, Sakekawa city, Mogami county, Yamagata pref.

• Tsuchiya (1989) Geology of the Osawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 6p.)