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Hirayama Member

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: Mudstone-dominant interbedded sandstone and mudstone

• Thickness: 900 m or thicker

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

• Distribution: Shizuoka pref.
• Fossils (Foraminifera): Candeina nitida, Globigerina bulloides, Globigerina decoraperla, Globigerina falconensis, Globigerina nepenthes, Globigerinella aequilateralis, Globigerinita glutinata, Globigerinoides bollii, Globigerinoides immaturus, Globigerinoides obliquus extremus, Globigerinoides obliquus obliquus, Globigerinoides sacculifer, Globigerinoides trilobus, Globoquadrina altispira, Globoquadrina dehiscens dehiscens, Globoquadrina venezuelana, Globorotalia conoidea, Globorotalia conomiozea, Globorotalia margaritae, Globorotalia menardii, Globorotalia miocenica, Globorotalia puncticulata, Globorotalia sphericomiozea, Globorotalia tumida tumida, Neogloboquadrina acostaensis, Neogloboquadrina pachyderma, Orbulina bilobata, Orbulina sturalis, Orbulina universa, Pulleniatina primalis, Sphaeroidinellopsis seminulina, Sphaeroidinellopsis subdehiscens

• 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.)