Nakagochi Formation

[ Top ] [ Japanese ]

Nakagochi 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
Correlation: Ishiai Member

Sedimentary facies: Marine
Lithofacies: Conglomerate, Interbedded sandstone and mudstone, Mudstone, Andesite lava, Volcaniclastic rocks

Thickness: ca. 3,000 m or thicker

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: Nakagochi river - Okitsu river - Yamakiri river - Hatauchi river, Shimizu ward, Shizuoka city, Shizuoka pref.
Fossils (Shellfishes): Balanus sp., Dentalium sp., Glycymeris totomiensis

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.)