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Omine Gravels Kobayashi and Hirabayashi, 1955

Invalid synonym: Omine Formation, Omine Conglomerate

• Type locality: Lake Iyari, Omachi city, Nagano prefecture
• Coherent formation
• early Pleistocene
• Correlation: Higher Terrace Deposit

• Sedimentary facies: Fluvial
• Lithofacies: Gravels, Tuffaceous sands, Tuffaceous gravels

• Source: river mouth of Takasegawa river - southern part of Nishina mountains
• Thickness: 4 m
• Upper limit: Unconformity (Omachi Tephra)
• Lower limit: Unconformity (Omine Formation)

• Distribution: Lake Iyari, Omachi city, Nagano pref.; Tazawa - Hikaribashi, Azumino city, Nagano pref.

• Harayama et al. (2009) Geology of the Matsumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 3p.)
• Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)
• Kato and Sato (1983) Geology of the Shinano-Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 7p.)