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Sai Formation (Kitamura et al., 1959) Uemura, 1962

• Type locality: Sai - Isotani, Sai city, Shimokita county, Aomori prefecture
• Coherent formation
• Miocene
• Correlation (Upper): Hinokigawa Formation
• Correlation (Lower): Kinpachizawa Formation

• Sedimentary facies: Marine
• Lithofacies: Shale, Tuff, Basaltic - Rhyolitic volcanic rocks
• Lithofacies (Basal): Conglomerate

• Thickness: ca. 1,500 m
• Upper limit: Unconformity (Yagen Formation, Ikokuma Andesites, Ohata Formation)
• Lower limit: Unconformity (Nagahama Formation)

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

• Distribution: Sai city, Shimokita county, Aomori pref.
• Fossils: Sponges (Makiyama chitanii)

• Uemura (1962) Oma and Sai, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 6p.)