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Taruda Formation Niigata University Research Group of Geology in Higashikubiki District, 1987
- Type locality: Oguro river, Taruda, Yasuzuka ward, Joetsu city, Niigata prefecture
- Coherent formation
- Rift basin sediments
- late Miocene (9 - 7 Ma, Tephra)
- Contemporaneous heterotopic facies (Upper): lower Sugawa Formation
- Correlation: Upper Teradomari Formation
- Sedimentary facies: Marine
- Depth of water: Deeper
- Lithofacies: Mudstone-dominant interbedded sandstone and mudstone, Mudstone
- Lithofacies (Minor): Sandstone-dominant interbedded sandstone and mudstone
- Sedimentary structures: Graded bedding, Parallel stratification
- Higashikubiki region, Niigata pref.
- [ Upper ]
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- Naradate Formation
- '''''''/,,,,,,
- Higashigawa Formation
- '''''''/,,,,,,
- Tamugigawa Formation
- '''''''/,,,,,,
- Sugawa Formation
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- Taruda Formation
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- Matsunoyama Formation
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Taruda - Mount Nagakura, Yasuzuka ward, Joetsu city, Niigata pref.; Mount Shachiyama, Sanwa ward, Joetsu city, Niigata pref.; Sakashita - Arayama, Matsunoyama, Tokamachi city, Niigata pref.
- Fossils: Foraminifera
- Tephra: Matsunoyama Tuff, Higashimatsunoki Tuff, Tt1, Tt2, Tt3, Tt4
- Takano (2011) Jour. Geol. Soc. Japan, vol.117, no.4, pp.238-258 DOI
- Takeuchi et al. (2000) Geology of the Matsunoyama Onsen District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 76p. (in Japanese with English abstract 5p.)
- Takeuchi and Kato (1994) Geology of the Takada-tobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 67p. (in Japanese with English abstract 5p.)