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Sakasagawa Formation Tanabe et al., 2002
- Type locality: Not indicated
- Coherent formation
- late Pleistocene - Holocene (18,100 - 13,700 yBP, 14C)
- Sedimentary facies: Swamp
- Lithofacies: Sands, Gravels, Silt
- Lithofacies (Minor): Peat
- Thickness: 6 m or thicker
- Distribution: Sakasa river, Togakushi, Nagano city, Nagano pref.
- Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)