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Oi Formation Minashi et al., 1984

• Type locality: Chiba prefecture
• Coherent formation
• Landward slope basin of trench
• early - middle Pleistocene
• Correlation: Kamo Formation

• Sedimentary facies: Marine
• Lithofacies: Scoriaceous sandstone
• Sedimentary structures: Cross stratification

• Thickness: 1 - 80 m or thicker
• Upper limit: Conformity (Hongo Formation)
• Lower limit: Unconformity (Minamiboso Group)

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

• Distribution: Chiba pref.

• Suzuki et al. (1990) Geology of the Nago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 3p.)