Okitomo Formation

Okitomo Formation Yoshida, 1963

Type locality: Ogeshima island - Kogeshima island, Imabari city, Ehme prefecture
Accretionary complex
Accretion: Jurassic
Intruded by: Kure Granite, Ojizo Granite, Geiyo Volcanic Rocks

Sedimentary facies: Marine
Lithofacies: Muscovite biotite hornfels, Cordierite hornfels
Lithofacies: Mudstone, Sandy mudstone, Sandstone
Lithofacies (Minor): Felsic tuff
Exotic blocks (Crusts): Limestone, Chert, Greenstones

Distribution (East - West): ca. 60 km
Distribution (South - North): ca. 15 km
Upper limit: Unconformity (H1 Breccia Member, H2 Rhyolite Member, H4 Dacite 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: Minami town - Matoba, Takehara city, Hiroshima pref.; Okitomo - Mitarai - Ohama - Kashiwashima island - Nakanoshima island - Herashima island - Mikadojima island - Onoura - Uchiura - Oura - Mount Shiratakeyama, Kure city, Hiroshima pref.; Kie - Noga, Osakikamijima city, Toyota county, Hiroshima pref.; Innoshma island, Onomichi city, Hiroshima pref.; Ogeshima island - Kogeshima island - Okamurajima island - Kojima island, Imabari city, Ehime pref.; Miyaura - Sanbonenoki - Mount Yakushimayama - Akebi, Imabari city, 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.)