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Takaishigawa Formation

• Coherent formation
• Pleistocene
• Interfingered (Upper, Mudflow deposit): Ashidaira Pyroclastic Rocks
• Interfingered: Lower Nobeyamahara Formation

• Lithofacies: Peat, Gravels, Sands, Mudflow deposit

• Thickness: 50 m
• Thickness (Peat): 0.5 - 9 m
• Upper limit: Unconformity (Honzawa Lava and Scoria)
• Lower limit: Unconformity (Uminokuchi Pyroclastic Rocks)

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

• Distribution: Takaishigawa river - Takamizawa bridge, Minamimaki city, Minamisaku county, Nagano pref.

• Kawachi (1977) Geology of the Yatsugatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 92p. (in Japanese with English abstract 4p.)
• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)