Geiyo Formation

[ Top ] [ Japanese ]

Geiyo Formation Higashimoto et al., 1985

Type locality: Yamaguchi prefecture
Accretion: Jurassic
Intruded by: Ojizo Granite, Nigata Granodiorite, Kamagari Dike Swarms, Kure Granite, Diorite porphyry dike

Sedimentary facies: Marine
Metamorphic facies: Ryoke Metamorphism, Contact metamorphism
Lithofacies: Hornfels
Lithofacies: Gravelly mudstone, Mudstone, Chert
Lithofacies: Mélange facies
Matrix: Mudstone
Exotic blocks (Crusts): Sandstone, Limestone, Tuffaceous sandstone, Mafic volcanic rocks, Meta-gabbro

Thickness: ca. 250 - 600 m
Upper limit: Unconformity (Nanakuniyama Clastic Member)

Okitomo Formation
[ Upper ]
/--/--/--/--/-
Geiyo Formation
/--/--/--/--/-
[ Lower ]

Kuga Group (Hiroshima pref. - Ehime pref.)
[ Upper ]
/--/--/--/--/-
Okitomo Formation
/--/--/--/--/-
[ Lower ]

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

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

Distribution: Hiromachi town - Tsukumo - Mount Shiratakeyama - Kotsubo - Nigata - Shimokamagarijima island - Shirosaki - Kamikamagarijima island - Mukai - Hajikami - Menokojima island, Kure city, Hiroshima pref.; Nishinomijima island, Etajima city, Hiroshima pref.; Yugeshima island, Kamijima city, Ochi county, Ehime pref.

Matsuura (2001) Geology of the Mitsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 58p. (in Japanese with English abstract 4p.)
Higashimoto et al. (1985) Geology of the Kure District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 6p.)