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Yachiho Mudflow Deposit

• Coherent formation
• Pleistocene

• Sedimentary facies: Mudflow deposit (2 flow units)
• Lithofacies: Breccia
• Lithofacies (Minor): Scoriaceous volcanic ash, Sands, Mud, Wood fragments

• Thickness: 50 m
• Thickness (A unit): 2 - 5 m
• Lower limit: Unconformity (Oishigawa Scoria, Kasuga Volcanic Rocks)

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

• Distribution: Chikuma river, Usuda, Saku city, Nagano pref.; Toyosato farm - Mizonohara - Shukudo - Fudeiwa, Komi city, Minamisaku county, Nagano pref.; Saguchi - Nakahata - Shimohata, Sakuho city, Minamisaku county, 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.)
• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)