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Hikiuma Member

• Coherent formation
• middle Pleistocene
• Contemporaneous heterotopic facies: Inasa Member, Sahama Mud Member, Mikkabi Member

• Sedimentary facies: Fluvial
• Sedimentary facies: River mouth, Delta
• Paleo-river system: Tenryugawa river
• Lithofacies: Gravels, Sandy gravels
• Lithofacies (Minor): Sands, Mud

• Thickness: 20 - 60 m
• Lower limit: Unconformity (Mikatagahara Gravel)

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

• Distribution: Hamamatsu city - Mikatagahara - Tenryugawa river - Handa - Sekishi town - Tomitsuka, Hamamatsu city, Shizuoka pref.
• Fossils: Crabs
• Fossils (Shellfishes): Barnea japonica, Rhaeta yokohamensis, Thora lubrica

• Isomi and Inoue (1999) Geology of the Hamamatsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 35p. (in Japanese with English abstract 4p.)