Tozurasawa Formation

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Tozurasawa Member

Probably this should be redefined to Member of Hamaishidake Formation

Invalid synonym: Tozurasawa Formation, Takaneyama Formation

Volcanic rocks
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: Andesite tuff breccia, Volcanic breccia, Volcanic conglomerate, Lapilli tuff, Dacite tuff breccia, Volcanic conglomerate, 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: Kiyoji - Shimoda, Shimizu ward, Shizuoka city, Shizuoka pref.
Fossils (Foraminifera): Globigerina falconensis, Globigerina foliata, Globigerina nepenths, Globigerina praebulloides, Globigerinoides obliquus extremus, Globigerinoides obliquus obliquues, Globigerinoides ruber, Globorotalia conomiozea, Neogloboquadrina acostaensis, Orbulina sturalis, 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.)