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Tsukahara Mudflow Deposit

• Coherent formation
• Sector collapse deposit by phreatic eruption of Kurofu volcano
• Pleistocene

• Sedimentary facies: Mudflow deposit, Mudflow hills
• Lithofacies: Gravels
• Lithofacies (Minor): Lapilli, Volcanic ash

• Distribution: ca. 90 km²
• Volume: probably 2 km³ or more

• Distribution: Iwamurata, Komoro city, Nagano pref.

• Kawachi and Aramaki (1979) Geology of the Komoro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 2p.)