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Odaira Formation

• Type locality: Odaira, Koromogawa, Oshu city, Iwate prefecture
• Coherent formation
• Pliocene
• Correlation: Tatsunokuchi Formation

• Sedimentary facies: Terrestrial, Shallow marine
• Lithofacies: Sandstone, Conglomerate, Tuff, Tuffaceous siltstone
• Lithofacies (Minor): Lignite, Ostrea reef

• Thickness: 150 - 400 m
• Upper limit: Interfingered (Kunimiyama Andesite)
• Lower limit: Unconformity (Mizuyama Formation)

• Distribution: Odaira, Koromogawa, Oshu city, Iwate pref.; Hosono, Kanegasaki city, Isawa county, Iwate pref.; Kamishishiawase, Isawa, Oshu city, Iwate pref.; Kitamata river - Minamimata river, Oshu city, Iwate pref.
• Fossils (Shellfishes): Anadara amicula, Callista brevisiphonata, Clinocardium fastosum, Macoma cf. calcarea, Macoma incongrua, Macoma cf. praetexta, Panope japonica, Patinopecten poculum, Schizothaerus keenae, Thracia cf. pertrapezoidea

• Kitamura (1965) Yakeishi-dake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 40p. (in Japanese with English abstract 8p.)