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Kuki Formation

• Coherent formation
• Oligocene

• Sedimentary facies: Non-marine
• Lithofacies (Upper): Interbedded sandstone and mudstone
• Lithofacies (Upper, Minor): Conglomerate
• Lithofacies (Lower): Conglomerate
• Lithofacies (Lower, Minor): Sandstone
• Sedimentary structures (Lower): Cross stratification

• Thickness: 170 m
• Thickness (Upper): 50 m
• Thickness (Lower): ca. 120 m
• Lower limit: Conformity (Minato Formation)

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

• Distribution: Mesawa river, Kuji city, Iwate pref.
• Fossils (Upper, Plants): Cercidiphyllum arcticum, Juglans nigella, Platanus aceroides, Ulmus sp.

• Yoshida et al. (1987) Geology of the Rikuchu-Ono District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)
• Shimazu and Teraoka (1962) Rikuchu-Noda, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 53p. (in Japanese with English abstract 11p.)