Wadashima Formation

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Wadashima Member

Probably this should be redefined to Member of Hamaishidake Formation

Invalid synonym: Wadashima Group

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: Interbedded sandstone and mudstone

Nakagochi Formation
[ Upper ]
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Tozurasawa Formation
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Wadashima Formation
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Mobata Formation
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Kanzawara Formation
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Nakaisshiki Formation
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[ Lower ]

Hamaishidake Formation (West)
[ Upper ]
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Okuyama Member / Kawaino Member
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[ Lower ]

Hamaishidake Formation (East)
[ Upper ]
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Ishiai Member
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Kangatake Member
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[ Lower ]

(Invalid name) Hamaishidake Group
[ Upper ]
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Kawaino Formation
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Nakagochi Formation
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Utsugino Formation
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Sattatoge Formation / Murono Formation
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Kogochi Formation
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[ Lower ]

Fujikawa Group (Central zone)
[ Upper ]
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Hamaishidake Formation / Akebono Formation
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Aimata Formation
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Kuonji Formation
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Hara Formation
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[ Lower ]

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

Distribution: Shizuoka pref.
Fossils (Foraminifera): Globigerina decoraperla, Globigerina felconensis, Globigerina nepenthes, Globigerinita glutinata, Globigerinita parkerae, Globigerinoides bollii, Globigerinoides conglobatus, Globigerinoides immaturus, Globigerinoides obliquus obliquus, Globigerinoides ruber, Globigerinoides sacculifer, Globigerinoides trilobus, Globoquadrina altispira, Globoquadrina venezuelana, Globorotalia cibaoensis, Globorotalia conoidea, Globorotalia merotumida, Globorotalia miozea conoidea, Globorotalia scitula, Globorotalia sphericomiozea, Globorotalia tumida plesiotumida, Neogloboquadrina acostaensis, Neogloboquadrina pachyderma, Orbulina universa, 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.)
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.)