Zenitsuboyama Formation

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Zenitsuboyama Formation

Accretionary complex
Accretion: Jurassic
Intruded by: Obatake Granodiorite, Kibe Granite

Sedimentary facies: Marine
Lithofacies: Chert, Mudstone, Sandstone
Lithofacies (Minor): Mélange facies
Matrix (Minor): Mudstone
Exotic blocks (Minor, Crusts): Chert, Sandstone, Limestone, Greenstones, Siliceous shale

Thickness: 850 m or thicker
Upper limit: Unconformity (Oguni Formation)

Kuga Group (southeastern Iwakuni, Yamaguchi pref.)
[ Upper ]
/--/--/--/--/-
Sorayama Mudstone Formation
--------------
Yoneyama Chert Formation
--------------
Rokuroshi Mudstone Formation
--------------
Odomari Chert Formation
/--/--/--/--/-
Zenitsuboyama Formation
/--/--/--/--/-
[ Lower ]

Tamba Belt (East Yamaguchi pref.)
[ Upper ]
/--/--/--/--/-
Mikawa Group
/--/--/--/--/-
Kuga Group
/--/--/--/--/-
[ Lower ]

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

Distribution: Arake - Mount Taishogunzan - Mount Zenitsuboyama, Iwakuni city, Yamaguchi pref.; Nakayama, Yanai city, Yamaguchi pref.

Higashimoto et al. (1983) Geology of the Iwakuni District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 6p.)