Kodaira Formation

Type locality: Kodaira, Oishida city, Kitamurayama county, Yamagata prefecture
Coherent formation
Miocene

Sedimentary facies: Marine
Lithofacies: Sandstone
Lithofacies (Minor): Coal

Lower limit: Bottom of the sandstone bed
Lower limit: Conformity (Aramachi Formation)

Kodaira Formation
[ Upper ]
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Oshikiri Shell Bed
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[ Lower ]

Mogami Group
[ Upper ]
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Kodaira Formation
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Aramachi Formation
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Fukazawa Formation
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[ Lower ]

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

Distribution: Kodaira, Oishida city, Kitamurayama county, Yamagata pref.; Tominami - Otakane, Murayama city, Yamagata pref.; Matsuhashi, Horiuchi, Funagata city, Mogami county, Yamagata pref.
Fossils (Shellfishes): Callista sp., Clinocardium iwasiroense, Clinocardium cfr. pseudofastosum, Dosinia ettyuensis, Glycymeris sp., Laevicardium shiobarense, Lucinoma aculitineata, Macoma cfr. calcarea, Mya cuneiformis, Mya japonica, Neptunea sp., Ostrea sp. Patinopecten paraplebejus, Serripes fujinensis, Serripes yokoyamai, Spisula nakayamana, Tellina sp., Thracia hilosaoensis

Tokunaga (1958) Obanazawa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 6p.)