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Osuga Tuff Member Akahane, 1975
- Type locality: Osuga bridge, Osuga, Nadachi ward, Joetsu city, Niigata prefecture
- Volcanic rocks
- Pliocene
- Sedimentary facies: Marine
- Depth of water: Continental shelf
- Lithofacies: Pumice tuff
- Lithofacies (Minor): Tuffaceous sandstone
- Sedimentary structures: Parallel stratification, Convolute foliation
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Osuga - Iwayado - Kurumaji - Takasumi - Nishiyamadera, Nadachi ward, Joetsu city, Niigata pref.
- Fossils@(Shellfishes): Anadara amicula, Anadara amicula elongata, Ancistrolepis sp., Clinocardium fastosum, Ennucula nipponica, Glycymeris yessoensis, Lepeta alba, Mercenaria yokoyamai, Neverita (Glossaulax) didyma, Patinopecten yessoensis yokoyamai, Tectonatica janthostoma, Umbonium (Suchium) akitanum
- Tephra: Osuga Tuff Bed (Oo, Oop)
- 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.)