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Ojima Formation

• Coherent formation
• Jurassic

• Lithofacies: Sandstone
• Lithofacies (Minor): Conglomerate

• Thickness: 10 - 30 m
• Upper limit: Transitional (Owada Formation)
• Lower limit: Unconformity (Mizunuma Formation, Isatomae Formation)

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

• Distribution: Nakairihata - Uchinohara - Ojima, Ishinomaki city, Miyagi pref.
• Fossils (Shellfishes): Myophorella sp., Vaugonia sp.

• Takizawa et al. (1984) Geology of the Ishinomaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 7p.)