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Utsugino Formation Shiba and Suruga Bay Collaborative Research Group, 1986

Probably this should be redefined to Member of Hamaishidake Formation

• Coherent formation
• Trough basin (Fujikawa Trough) -fill deposit at the collision boundary between Izu-Bonin-Mariana arc and Southwest - East Japan island arc
• Back-arc basin volcanic activity at the back-arc basin of Izu-Bonin-Mariana arc
• late Miocene - Pliocene

• Sedimentary facies: Marine
• Lithofacies: Conglomerate, Mudstone-dominant interbedded sandstone and mudstone

• Thickness: 900 - 2,000 m or thicker

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

• Distribution: Ogochi river, Shimizu ward, Shizuoka city, Shizuoka pref.

• 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.)