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Oshika Gravel Bed

• Coherent formation
• Pleistocene
• Correlation: Obaradai Sand and Gravel Formation, Kasana Terrace Deposits, upper Ogasa Group, Shimosueyoshi Formation, Narimasu Formation

• Sedimentary facies: Gravelly delta deposit of Abegawa river
• Lithofacies: Gravels
• Lithofacies (Minor): Sands

• Thickness: ca. 10 - 40 m
• Upper limit: Unconformity (Kuniyoshida Gravel Bed)
• Lower limit: Transitional (Kusanagi Mud Bed), Unconformity (Kunozan Gravel Bed)

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

• Distribution: Nihondaira, Shizuoka pref.; Mabase, Shimizu ward, Shizuoka city, Shizuoka pref.
• Tephra: On-Pm1

• Sugiyama and Shimokawa (1990) Geology of the Shimizu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 8p.)
• Sugiyama et al. (1982) Geology of the Shizuoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 82p. (in Japanese with English abstract 9p.)