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Nakasaki Tuff Member

• Volcanic rocks
• Late Cretaceous (56.3 Ma, K-Ar, 63.1 Ma, FT)

• Lithofacies: Tuffaceous sandstone
• Lithofacies (Minor): Tuffaceous mudstone
• Sedimentary structures: Parallel stratification

• Thickness: 0 - 100 m
• Lower limit: Conformity (Kasadani Formation)

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

• Distribution: Mount Nakasakisan, Okuhidaonsengo, Takayama city, Gifu pref.

• Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)