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Onuki Formation

Invalid synonym: Semine Formation

• Type locality: Onuki, Tajiri, Osaki city, Miyagi prefecture
• Coherent formation
• Pliocene
• Correlation: Omotezawa Formation
• Correlation (Upper): Tsukidate Formation
• Correlation (Lower): Kazawa Formation
• Correlation?: Kitayama Formation, Yagiyama Formation

• Sedimentary facies: Terrestrial
• Lithofacies: Sandstone, Tuff, Siltstone, Mudstone
• Lithofacies (Basal): Gravelly sandstone
• Lithofacies (Minor): Lignite
• Sedimentary structures: Cross stratificaiton

• Thickness: 50 - 80 m
• Upper limit: Unconformity (Takashimizu Formation)
• Lower limit: Unconformity (Tatsunokuchi Formation)

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

• Distribution: Onuki, Tajiri, Osaki city, Miyagi pref.

• Takahashi and Matsuno (1969) Geology of the Wakuya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 26p. (in Japanese with English abstract 6p.)