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Lower I Terrace Deposit
- Coherent formation
- Pleistocene
- Sedimentary facies: Fluvial
- Lithofacies: Gravels
- Lithofacies (Minor): Sands, Mud
- Distribution: Shirakawa river - Tochori (Kotaru river) - Monzen (Inukawa river) - Oishizawa (Yokokawa river) - Takamine - Shimoyachi - Kamiyachi - Hirogawara - Koya river, Iide city, Nishiokitama county, Yamagata pref.
- Yanagisawa and Yamamoto (1998) Geology of the Tamaniwa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)