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Shomen Terrace Deposit Shinano River Terrace Research Group, 1968

• Type locality: Shomen, Tsunan city, Nakauonuma county, Niigata prefecture
• Coherent formation
• Terrace deposit
• Pleistocene (ca. 25 - 20 ka; 12,160, 11,700 yBP, ¹⁴C)
• Correlation: T₇ Terrace Deposit

• Climate: Cooler than the present climate
• Lithofacies: Gravels
• Lithofacies (Minor): Sands, Silt
• Sedimentary structures: Imbrication

• Thickness: 3.5 - 15 m
• Upper limit: Unconformity (Kaisaka Loam)

• Distribution: Shomen - Tatsunokuchi - Ashigasaki - Miyanohara - Momonoki - Hakura - Funayamashinden, Tsunan city, Nakauonuma county, Niigata pref.: Shinano river - Kiyotsu river, Himizo, Tokamachi city, Niigata pref.; Imokawashinden - Daikokuzawa, 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.)