Nakaisshiki Formation

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Nakaisshiki Member

Probably this should be redefined to Member of Hamaishidake 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 lava, Volcaniclastic rocks

Upper limit: Conformity (Kangatake Member)

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 falconensis Globigerina nepenthes, Globigerinita glutinata, Globigerinoides obliquus obliquus, Globigerinoides ruber, Globigerinoides sacculifer, Globigerinoides trilobus, Globoquadrina altispira, Globorotalia menardii, Globorotalia miozea conoidea, Globorotalia scitula, Globorotalia tumida tumida, Neogloboquadrina acostaensis, Orbulina universa, Pulleniatina primalis, Sphaeroidinella dehiscens, 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.)