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Yukawa Formation

• Volcanic rocks
• Pleistocene

• Lithofacies: Scoriaceous gravels
• Lithofacies (Minor): Volcanic breccia, Scoria agglomerate, Scoria, Scoriaceous sands

• Thickness: 50 m
• Upper limit: Unconformity (Honzawa Lava and Scoria)
• Lower limit: Unconformity (Ashidaira Pyroclastic Rocks)

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

• Distribution: Yukawa river - Inago, Komi city, Minamisaku county, Nagano pref.

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