Oshimizu Formation

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Oshimizu Formation Yoneyama Research Group, 1967

Type locality: Manzo river, Kakizaki ward, Joetsu city, Niigata prefecture
Coherent formation
late Miocene
Contemporaneous heterotopic facies: upper Ogaya Formation
Correlation: Shiiya Formation

Sedimentary facies: Marine
Sedimentary facies: Turbidite
Lithofacies: Interbedded sandstone and mudstone, Sandstone

Thickness: ca. 200 - 500 m
Upper limit: Transitional (Hijirigahana Formation), Unconformity (Yoneyama Formation)
Lower limit: Conformity, partly interfingered (Ogaya Formation)

Kakizaki, Niigata pref.
[ Upper ]
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Uragawara Formation
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Tamugigawa Formation
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Takegahana Formation
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Hijirigahana Formation
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Oshimizu Formation
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Ogaya Formation
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[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Manzo river, Kakizaki ward, Joetsu city, Niigata pref.; Byodoji, Yoshikawa ward, Joetsu city, Niigata pref.; Harai river, Kashiwazaki city, Niigata pref.
Fossils: Plants
Fossils (Foraminifera): Cyclammina japonica, Haplophragimoides, Martinottiella communis, Uvigerina urnula

Takeuchi et al. (1996) Geology of the Kakizaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 5p.)