List of geological units in Okayama prefecture

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A list of stratigraphic units, igneous bodies, and geological structures reported from Okayama prefecture, Chugoku region, Honshu island, Japan.

Photographs of geological units in Okayama prefecture

Paleozoic

Yamano group

Mihara formation

Silurian-Permian

Maizuru Belt

South zone

Yakuno Complex

Basalt Shale Unit: Tonoshiki Formation

Carboniferous-Permian

Sangun metamorphic rocks

Nakamura group

Koyama group

Yoshii group

Carboniferous-Jurassic

Maizuru Belt: North zone

Carboniferous (358.9-298.9 Ma)

Atetu group

Nagoe formation

Mitsudo group: Kodani formation

Hina limestone

Permian (298.9-252.17 Ma)

Atetsu group

Yukawa group: Terauchi formation; Maki formation; Kanikawa formation

Sabushi group: Shoyama formation; Iwamoto formation

Maizuru Belt

Central zone

Maizuru Group: Upper Formation; Middle Formation; Lower Formation; Bottom Formation

Yakuno Ophiolite

Uji formation

Fuka formation

Ultra-Tamba Belt: Kozuki Formation; Oi Formation (Ejiri formation); Hikami Formation (Mantomi formation)

Permian-Jurassic

Tanba belt: Tanba group

Mesozoic

Yanahara group

Triassic (252.17-201.3 Ma)

Maizuru Belt

Central zone

Yanagi Formation

Fukumoto Group: Miyanooku Formation; Kyogakubo Formation; Kusano Formation

Kanakawa formation

Nakaiso formation

Kyowa formation

Hirono formation

Nariwa Group: Hinabata Formation; Hina Formation; Mogamiyama Formation; Jito Formation; Niga Formation; Shodera formation

Jurassic (201.3-145.0 Ma)

Katsuyama shear zone (Hida marginal belt): Yamaoku formation

Cretaceous (145.0-66.0 Ma)

Kanmon group (Kenseki formation)

Hayama formation: Sora member; Eda member

Inakura formation

Odo rhyolite

Takanomine andesite

Hiroshima granite: Mannari granite

Paleogene

Maejima Formation

Paleogene-Neogene

Futamatayama lava

Fujita formation

Muneage formation

Shiodaki formation

Eocene (56.0-39.0 Ma)

Hiruzen volcano: Hiruzen lava; Mizokuchi tuff breccia; Upper tephra bed; Lower tephra bed

Banda Basalt

Kushinoyama Basalt

Kitagata Formation

Eocene-Oligocene

Namigata Formation: Main part; Senjuin Shell-Sandstone Member; Onishi Conglomerate Member

Kibi Formation, Yamajari Formation

Tomiyoshi Formation: Motomura Member; Minohata Member; Kazahaya Member

Tsudaka Formation: Karako Member; Sugano Member; Nakayama Member

Takase formation

Oligocene (33.9-23.03 Ma)

Yagane Formation

Miocene (23.03-5.33 Ma)

Katsuta Group: Takakura formation; Yoshino Formation; Uetsuki formation

First Setouchi Supergroup

Bihoku Group: Tajibe Formation

Nichiôji Formation

Ukan Formation: Tsuneyama Siltstone Member; Azechi Sandstone and Conglomerate Member; Shimoyokomi Sandstone and Conglomerate Member; Yamagata Muddy Sandstone Member; Suzuoka Conglomerate Member

Miocene-Pliocene

Misasa group

Pleistocene (2.58- 0.01Ma)

Hiruzenbara formation

Daisen tuff bed: Upper bed; Middle bed; Lower bed; Lowest bed

Nihonbara formation

Aira-Tn tuff bed (AT, Kinako tuff bed)

Geological structures

Nichioji thrust fault

Hane thrust fault

Oga thrust fault (Oga decken)

Mimasaka thrust fault

Mori thrust fault

Hina thrust fault

Hayama decken

Senpo fault

Katsuyama shear zone

Ushimado fault zone

Goishi anticline

Iigoshi unconformity?