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Dai Gravel Oka et al., 1979

• Type locality: Oba shrine, Dai, Oba, Fujisawa city, Kanagawa prefecture
• Coherent formation
• Terrace deposit
• Pleistocene

• Lithofacies: Sands, Gravels

• Thickness: 0.5 - 1.0 m
• Upper limit: Conformity (Musashino Loam), Unconformity (Tachikawa Loam)
• Lower limit: Unconformity (Tsuchiya Formation)

• Distribution: Oba - Sakaigawa river - Hikijigawa river, Fujisawa city, Kanagawa pref.

• Oka et al. (1979) Geology of the Fujisawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 5p.)