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Namegawa Debris Avalanche Deposit (Akutsu, 1957)

Invalid synonym: Namegawa Tuff Breccia, Namegawa Mudflow Deposit

• Coherent formation
• Sector collapse deposit of Nyoho-Akanagi volcano
• Pleistocene (150 ka)

• Lithofacies: Debris avalanche deposit

• Upper limit: Unconformity (Kanuma Terrace Deposit)

• Distribution: Myojin, Nikko city, Tochigi pref.

• Suzuki (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.121-133 DOI
• Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)