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Yokobatake Alternation of Sandstone and Mudstone Member Akahane, 1975
- Type locality: Kuwatori river, Yokobatake, Kuwatori, Joetsu city, Niigata prefecture
- Coherent formation
- Rift basin sediments
- Miocene
- Middle - Upper: Miocene (8.0 - ? Ma)
- Lower: Miocene (? - 8.0 Ma, Foraminifera)
- Correlation: Lower Teradomari Formation
- Sedimentary facies: Marine
- Sedimentary facies (Middle - Upper): Submarine fan (Muddy channel levee system type)
- Sedimentary facies (Lower): Submarine fan (Sandy radial fan type)
- Sedimentary facies: Upper part of the 5th marine regression - transgression sequences of Nambayama Formation
- Lithofacies (Upper): Sandy turbidite
- Lithofacies (Lower): Muddy turbidite
- Lithofacies: Interbedded sandstone and mudstone
- Lithofacies (Lower): Sandstone, Mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kuwatori river, Yokobatake, Kuwatori, Joetsu city, Niigata pref.; Nishihiyama - Hayakawa river, Itoigawa city, Niigata pref.; Kamitsunako - Nakanomata - Gimyo - Higashihiyama - Shionidani, Joetsu city, Niigata pref.; Aota - Inoyama - Nishinoya, Myoko city, Niigata pref.
- Fossils (Shellfishes): Anadara sp., Arca sp., Clinocardium sp., Glycymeris sp., Portlandia sp.
- 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.)