Rokuroshi Mudstone Formation

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Rokuroshi Mudstone Formation

Accretionary complex
Accretion: Jurassic
Correlation: Arase Mudstone Formation

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

Thickness: 300 - 400 m
Upper limit: Conformity (Yoneyama Chert Formation)
Lower limit: Conformity (Odomari Chert 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: Yuugawa river - Rokuroshi - Mineyama - Sorayama - Shimohata, Iwakuni 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.)