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J Alternation of Sandstone and Mudstone Akahane, 1975
- Type locality: Kuwatori river - Nishiyachi river, Yokobatake, Joetsu city, Niigata prefecture
- Coherent formation
- Rift basin sediments
- Miocene (10.0 or 9.5 - ? Ma)
- Sedimentary facies: Marine
- Sedimentary facies: Submarine fan (Sandy radial fan type)
- Sedimentary facies: Lower part of the 5th marine regression - transgression sequences
- Sedimentary facies: Sandy turbidite
- Lithofacies: Sandstone-bearing interbedded sandstone and mudstone
- Lithofacies (Minor): Sandstone, Interbedded sandstone and mudstone, Gravel-bearing mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kuwatori river - Nishiyachi river - Nadachi river - Mount Hachimaki, Ushirodani, Joetsu city, Niigata pref.; Mount Kagomachi-Nanbayama - Mount Awadachi, Myoko 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.)