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H Alternation of Sandstone and Mudstone Akahane, 1975
- Type locality: Kuwatori river - Nishiyachi river, Yokobatake, Joetsu city, Niigata prefecture
- Coherent formation
- Rift basin sediments
- Miocene
- Sedimentary facies: Marine
- Sedimentary facies: Submarine fan (Sandy radial fan type)
- Sedimentary facies: Lower part of the 4th marine regression - transgression sequences
- Sedimentary facies: Sandy turbidite
- Lithofacies: Sandstone-dominant interbedded sandstone and mudstone
- Lithofacies (Minor): Mudstone, Shale, Interbedded sandstone and mudstone, Sandstone, Gravel-bearing mudstone, Conglomerate, Tuff
- Sedimentary structures: Groove marks, Flute marks
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kuwatori river - Nishiyachi river - Mount Shigekura - Nadachi river, Joetsu city, Niigata pref.; Mount Aota-Nanbayama - Mount Awadachi, Myoko city, Niigata pref.; Hanareyama, Itoigawa 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.)