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Jinba Debris Avalanche Deposit (Oshima, 1986) Geshi and Takeuchi, 2012

• Type locality: Arai, Shinto city, Kitagunma county, Gunma prefecture
• Coherent formation
• Pleistocene (between 20 ka and 15 ka)

• Lithofacies: Orthopyroxene hornblende andesite breccia, Lapilli, Volcanic ash

• Thickness: 40 m
• Upper limit: Unconformity (Younger Haruna Volcanic Fan Deposits)
• Lower limit: Unconformity (Older Haruna Volcanic Fan Deposits, Shirakawa Pyroclastic Flow Deposit, Younger Haruna Volcanic Fan Deposits)

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

• Distribution: Arai - Somagahara, Shinto city, Kitagunma county, Gunma pref.

• Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)