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B Mudstone Member Akahane, 1975
- Type locality: Shiun valley, Nadachi river, Nadachi ward, Joetsu city, Niigata prefecture
- Coherent formation
- Rift basin sediments
- Miocene (? - 12.3 Ma, Feraminifera)
- Sedimentary facies: Marine
- Sedimentary facies: Submarine fan (Sandy radial fan type)
- Sedimentary facies: Upper part of the 1st marine regression - transgression sequences
- Sedimentary facies: Muddy turbidite
- Lithofacies: Mudstone
- Lithofacies (Minor): Sandstone, Interbedded sandstone and mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Shiun valley - Kanba creek, Nadachi river, Nadachi ward, Joetsu city, Niigata pref.
- Takano (2011) Jour. Geol. Soc. Japan, vol.117, no.4, pp.238-258 DOI
- 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.)