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Tsumagoi Pyroclastic Flow Deposit

Invalid synonum: Tsumakoi Pumice Flow Deposit

• Tephra
• Pleistocene

• Lithofacies: Pyroclastic flow deposit
• Lithofacies: Pumice tuff
• Lithofacies (Minor): Charcoal

• Thickness: 100 - 150 m
• Upper limit: Unconformity (Kanbara Mudflow Deposit)
• Lower limit: Unconformity (Imai Gravels, Okuwa Debris Avalanche Deposit, Ojo Formation, Kadokai Formation, Agatsuma Clay, Oshi Pyroclastic Flow Deposit)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: right bank of 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.)