[ Top ] [ Japanese ]

Agatsuma Clay

• Coherent formation
• Dammed lake-fill deposit of Agatsuma river
• Pleistocene

• Sedimentary facies: Lacustrine
• Lithofacies: Clay
• Lithofacies (Minor): Sands, Gravels
• Sedimentary structures: Parallel stratification

• Thickness: One hundred and several dozen m
• Upper limit: Unconformity (Asama-Eboshi volcanoes, Tsumagoi Pyroclastic Flow Deposit, Okuwa Debris Avalanche Deposit, Kanbara Mudflow Deposit)
• Lower limit: Unconformity (Kadokai Formation, Kaminokai Lavas, Banki Lava, Ojo Formation, Oshi Pyroclastic Flow Deposit)

• Distribution: 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.)