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Imai Gravels

• Coherent formation
• Pleistocene

• Sedimentary facies: Fluvial
• Lithofacies: Gravels, Sands
• Lithofacies (Minor): Lignite

• Upper limit: Unconformity (Tsumagoi Pyroclastic Flow Deposit, Oiwake Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Kadokai Formation, , Oshi Pyroclastic Flow Deposit)

• Distribution: Agatsuma river, Agatsuma county, Gunma pref.

• Ota (1957) Kusatsu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 8p.)