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Nagahama Mudstone Member Akahane, 1975

• Type locality: Nagahama - Mount Yakushi, Joetsu city, Niigata prefecture
• Coherent formation
• Rift basin sediments
• Pliocene
• Contemporaneous heterotopic facies: Tsutsuishi Alternation of Sandstone and Mudstone Member, Tsunako Conglomerate Member

• Sedimentary facies: Marine
• Lithofacies: Mudstone, Mudstone-dominant interbedded sandstone and mudstone
• Lithofacies (Minor): Tuff, Conglomerate, Gravel-bearing mudstone, Sandstone

• Thickness: 600 - 700 m
• Lower limit: Conformity (Tsunako Conglomerate Member)

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

• Distribution: Nagahama - Mount Yakushi - Nakanomata river, Joetsu city, 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.)