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Joetsu Group Akahane, 1975

• Coherent formation
• Pliocene

• Lithofacies: Mudstone

• Thickness: less than 1,000 m
• Lower limit: Conformity (Nishikubiki Group)

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

• Distribution: Niigata pref.

• Akahane and Kato (1989) Geology of the Takada-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 89p. (in Japanese with English abstract 3p.)