Z3 Formation

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Z3 Formation Sugiyama and Shimokawa, 1990

Coherent formation
Trough basin-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: Gravel-bearing mudstone, Conglomerate

Thickness: Several - 20 m

Fujikawa Group (southern Shimizu, Shizuoka pref.)
[ Upper ]
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Z3 Formation
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Hozumi Formation
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Nagao Formation
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Kitataki Formation / Kashio Formation
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Isabu Formation / Yoshiwara Formation
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[ Lower ]

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

Distribution: Shizuoka pref.
Fossils (Foraminifera): Lepidocyclina sp.

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.)