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Karayama Landslide Deposits Yanagisawa et al., 2000

Invalid synonym: Sekida Debris Flow Deposit

• Type locality: Karayama, Iiyama city, Nagano prefecture
• Coherent formation
• middle Pleistocene

• Sedimentary facies: Debris avalanche deposit, Mudflow hills (8 hills or more)
• Lithofacies: Andesite breccia

• Source: in the vicinity of ca. 800 above sea level, southeastern slope of Sekida mountains
• Thickness: 70 m
• Distribution (East-West): 4 km
• Distribution (South-North): 2 km
• Distribution (Pyroclastic cones, Major axis): ca. 100 - 300 m
• Upper limit: Unconformity (Oshika Scoria Group)

• Distribution: Chikuma river, Karayama - Nishiotaki, Iiyama city, Nagano pref.

• Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)