Kogorosan Formation

[ Top ] [ Japanese ]

Kogorosan Formation Takahashi et al., 1989

Accretionary complex
Early - Middle Permian (Radiolarians)

Sedimentary facies: Marine
Lithofacies: Sandstone, Interbedded sandstone and mudstone
Lithofacies (Minor): Chert, Gravel-bearing mudstone

Upper limit: Unconformity (Migitaniyama Formation)
Lower limit: Kitayama Thrust (Tsuno Group)

Nishiki Group
[ Upper ]
/--/--/--/--/-
Mikazura Formation
--------------
Migitaniyama Formation
--------------
Kogorosan Formation
/--/--/--/--/-
[ Lower ]

Akiyoshi Belt
[ Upper ]
/--/--/--/--/-
Tsunemori Formation
/--/--/--/--/-
Akiyoshi Limestone
/--/--/--/--/-
Ota Group
/--/--/--/--/-
Nishiki Group
/--/--/--/--/-
[ Lower ]

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

Distribution: Sugawa - Mount Kogorosan, Iwakuni city, Yamaguchi pref.

Takahashi et al. (1989) Geology of the Tsuda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 56p. (in Japanese with English abstract 4p.)