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Oriwatari Formation

• Type locality: Mogami river, Oriwatari, Funagata city, Mogami county, Yamagata prefecture
• Coherent formation
• Pliocene
• Correlation (Upper): Motoaikai Formation
• Correlation (Lower): Yamuke Formation

• Lithofacies: Conglomerate, Sandstone, Shale, Tuffaceous shale
• Lithofacies (Minor): Coal

• Thickness: 200 - 400 m
• Thickness (Middle part): 100 - 220 m

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

• Distribution: Mogami river, Oriwatari, Funagata city, Mogami county, Yamagata pref.
• Fossils (Plants): Comptonia kidoi, Glyptostrobus sp., Taxodium sp.
• Deposit: Mogami coal field

• 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.)