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Owarino I Terrace Deposit Shinano River Terrace Research Group, 1968

• Type locality: Nakatsugawa bridge, Owarino, Tsunan city, Nakauonuma county, Niigata prefecture
• Coherent formation
• Terrace deposit
• Pleistocene (ca. 22 ka or later)

• Lithofacies: Sands, Gravels
• Lithofacies (Upper): Silt
• Sedimentary structures: Imbrication

• Thickness: ca. 4 m

• Distribution: Owarino - Soriguchi - Funayama - Shinano river, Tsunan city, Nakauonuma county, Niigata pref.; Shinano river, Tokamachi city, Niigata pref.

• Takeuchi et al. (2000) Geology of the Matsunoyama Onsen District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 76p. (in Japanese with English abstract 5p.)
• Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)