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Otsubo Formation Kashiwazaki Plain Research Group, 1966

• Type locality: Otsubo, Nishiyama town, Kashiwazaki city, Niigata prefecture
• Coherent formation
• middle Pleistocene
• Correlation: Oyama Formation, Tazawa Formation, Kume Conglomerate

• Sedimentary facies: Terrestrial
• Lithofacies: Gravels, Sands, Silt

• Thickness: 20 m or thicker
• Upper limit: Unconformity (Yasuda Formation)
• Lower limit: Unconformity (Uonuma Formation, Haizume Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Otsubo - Tazawa - Ikeura, Nishiyama town, Kashiwazaki city, Niigata pref.

• Kobayashi et al. (1995) Geology of the Kashiwazaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 102p. (in Japanese with English abstract 4p.)