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Younger Obasute Mudflow Deposit Kato and Akahane, 1986

• Type locality: Obasute, Koshoku, Chikuma city, Nagano prefecture
• Coherent formation
• Sector collapse deposit of Mitsumineyama volcano
• middle Pleistocene (3,250 yBP, C¹⁴)

• Sedimentary facies: Mudflow deposit
• Lithofacies: Breccia, Gravels
• Lithofacies (Minor): Sandy mud, Clay

• Thickness: 10 - 20 m
• Lower limit: Unconformity (Older Obasute Mudflow Deposit)

• Distribution: Obasute - Mine - Tsuji - Kamimachi - Dai, Koshoku, Chikuma city, Nagano pref.

• Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)
• Kato (1980) Geology of the Sakaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)