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

Sangun Metamorphic Rocks

Sangun Metamorphic Rocks

Tomada Formation: Okunotaira Alternation Member; Kamiyokonookudani Clayslate Member; Karasugasen Alternation Member; Shimmei Clayslate Member

Aida Formation: Nankai Clayslate Member; Kusakabe Clayslate Member

Yamano group

Mihara formation

Silurian-Permian

Maizuru Belt

South zone

Yakuno Complex

Basalt Shale Unit: Tonoshiki Formation

Carboniferous-Permian

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; Yanahara Group; Kose Group; Dodo Group; Omoriyama Formation

Yakuno Complex

Uji formation

Fuka formation

Ultra-Tamba Belt: Kozuki Formation; Mantomi Unit; Ejiri Unit; Mushiage Unit; Hijima Formation

Mesozoic

Nagisan Andesites

Gandoya Tuff Breccia

Tsugawagawa Conglomerate

Tenguiwa Gabbro

Donishikitoge Gabbro

Triassic (252.17-201.3 Ma)

Maizuru Belt

Central zone

Nakaiso Conglomerate Bed

Yanagi Formation

Fukumoto Group: Miyanooku Formation; Kyogakubo Formation; Kusano Formation

Kanakawa formation

Hirono Formation: Shimoyama Alternation Member; Fukui Alternation Member; Doi Coal-bearing Member; Shimouryubara Alternation Member

Kyowa 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

Tamba Belt: Goishigawa Unit; Tamba Group

Cretaceous (145.0-66.0 Ma)

Hayama formation: Sora member; Eda member

Inakura formation

Hiroshima Granites: Nibori Granite; Mannari granite

Misaoyama Granite

Nagashima Granite

Yotsujiyama Granite

Myokenzan Granodiorite

Osafune Granite

Momoezuki Quartz Diorite

Aioi Group

Ako Formation: Hatsutoji Member

Tsurukamejobu Formation: Takidani Member; Kagami Member

Tsurukamekabu Formation: Shimobata Member

Midano Formation

Tenguyama Andesite

Shashakiyama Formation

Takasagoyama Formation

Hinase Formation

Dodozan Formation

Wake Formation

Kumayama Welded Lapilli Tuff Member

Wakefuji Rhyolite Member

Fujino Tuff Member

Yoshinaga Welded Lapilli Tuff Member

Myojinyama Welded Lapilli Tuff Member

Yagitani Welded Tuff Member

Hirayamadani Welded Tuff Member

Nodani Tuff Member

Daiyama Welded Lapilli Tuff Member

Renjaku Quartz Diorite

Sukeyasu Quartz Diorite

Honzanji Granodiorite

Myokenzan Granodiorite

Daito Rhyolites

Cretaceous-Paleogene

Kirinzan-Okurayama-Hanamiyama Body

Paleogene

Tottori Granite: Sugo Body; Sasao Body

Paleogene-Neogene

Futamatayama lava

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

Susai Formation

Takase formation

Oligocene (33.9-23.03 Ma)

Yagane Formation

Miocene (23.03-5.33 Ma)

Katsuta Group

Takakura Formation: Takata Sandstone Mudstone Member; Ozawa Sandstone Mudstone member

Yoshino Formation: Izumoto Sandstone Member; Makabe Conglomerate Member

Uetsuki Formation: Ikegahara Coal-bearing Member; Takane Coal-bearing Member; Kawasaki Conglomerate Member

First Setouchi Supergroup

Bihoku Group: Tajibe Formation

Nichioji Formation

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

Fujita Formation

Nerigami Basalt

Konomine Andesite

Miocene-Pliocene

Misasa group

Pliocene (5.33-2.58 Ma)

Tando Tuff Breccia

Nakatsugo Andesites

Takashimizu Basalts

Takamatsuyama Rhyolite

Mihirayama Andesite

Ningyotoge Formation

Kuroiwa Basalt Lava

Gorinbara Basalt Lava

Happongoshi Andesite Lava

Iwabuchi Basalt Lava

Pleistocene (2.58- 0.01Ma)

Hiruzen volcano group

Kamihiruzen volcano: Kamihiruzen Lava

Nakahiruzen volcano: Nakahiruzen Lava

Shimohiruzen volcano: Upper Shimohiruzen Lava; Lower Shimohiruzen Lava

Futamatasen volcano: Futamatasen Lava

Giboshisen volcano: Giboshisen Lava

Hiruzenbara Formation

Nihonbara Formation

Highland Gravel Beds

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

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?