List of geological units in Shimane prefecture

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

Photographs of geological units in Shimane prefecture

Permian (298.9-252.17 Ma)

Nishiki Group

Jurassic (201.3-145.0 Ma)

Tamba Belt: Kanoashi Complex

Higuchi Group: Higuchidani Formation; Orojidani Formation

Cretaceous (145.0-66.0 Ma)

Kanmon Group

Sanin Belt

Mochigase stage volcanic rocks: Yakumo volcanic rock; Ochi Group; Hikimi Group

Mochigase intrusive rocks

Paleocene-Eocene

Sanin Belt

Older Inbi stage intrusive rocks: Asagaridani Granodiorite; Hobutsusan Granite; Kamiiwami Granite; Uchiidani Granophyre

Younger Inbi intrusive rocks

Abire Granodiorite: Abire intrusion; Yokota intrusion; Ryukoma intrusion

Inbi stage volcanic rocks: Daito volcanic rocks; Kamishima volcanic rocks; Gotsu volcanic rocks

Eocene (56.0-33.9 Ma)

Sanin Belt

Tamagawa stage volcanic rocks: Sakurae Formation

Eocene-Oligocene

Sanin Belt

Tamagawa stage volcanic rocks

Kawamoto Granodiorite: Kawamoto body; Mihara body

Kotani Formation

Kokubu Volcanic Rocks

Oligocene (39.0-23.03 Ma)

Sanin Belt

Tamagawa stage volcanic rocks: Komatsuji Formation; Toburodani Formation

Miocene (23.03-5.33 Ma)

Koura Formation: Udeyama Sandstone-dominated sandstone-mudstone Member; Shichirui Sandstone-dominated sandstone-mudstone Member; Takaoyama Andesitic volcaniclastics Member; Ui sandstone-mudstone Member

Daito formation

Tanitadani formation

Togane Formation: Tatamigaura Sandstone Member; Kanaso Conglomerate and Sandstone Member; Anegahama Sandstone Member; Toganegawa Mudstone Member

Taisha formation

Tadaura formation

Wanibuchi formation

Bihoku group

Jinzai Formation: Jinzai Basalt

Matsue Formation: Matsue Basalt

Takashibuyama Formation

Fujina Formation: Kimachi Formation

Yoshida Plutonic Complex

Nodayama Plutonic Complex

Miocene-Pliocene

Wakurayama Dacite: Type I lava; Type II lava; Type III lava

Pliocene-Pleistocene

Tsunozu Formation: M4 formation; M3 formation; M2 formation; M1 formation

Jelly tuff bed

Oetakayama volcanoes

Pleistocene (2.58- 0.01Ma)

Daikonjima Basalt

Eshima Basalt

Yasugi Formation

Yumigahama Formation: Ym1 tuff bed; Ym2 tuff bed

Shigeguri Andesite

Kokubu Formation

Kisuki pumice bed (Koshibara pumice bed, Lower Sanbe tuff bed)

Daisen-Matsue pumice bed (Agenoki pumice bed)

Fujina formation: Kimachi formation

Noshira formation

Nogi formation

Yamamawari formation

Sashiumi formation (Yumachi formation)

Okudani formation

Oba formation

Upper Daisen tuff bed (DU)

Kurayoshi (DK, Middle Daisen tuff bed)

Lower Daisen tuff bed (DL)

Lowest Daisen tuff bed

Kandogawa pumice bed (K1)

Ishitani formation

New sand dune deposit (Izumo sand dune deposit): Myoken formation

Ikeda formation: Ikeda tuff bed (I2); Ikeda pumice bed

Koyahara tuff bed

Old Sanbe volcano: Ota formation

Ota tuff bed

New Sanbe volcano: Hikageyama lava

Sambe-Ukinuno Tephra

Bafun pumice bed

Iinan tuff bed

Shigaku tuff bed

Shigaku pyroclastic flow deposit

Old sand dune deposit (Izumo sand dune deposit)

Sotozono formation

Sakaiminato formation

Mizoguchi formation

Mikuriya formation

Yokota plant deposit

Yura formation

Holocene (0.01-0 Ma)

Nakaumi Formation

New sand dune deposit (Izumo sand dune deposit): Hamayama formation

Tsunoi tuff bed

New Sanbe volcano: Sanbe lava

Ohirayama tuff bed

Ohirayama pyroclastic flow deposit

Chojabara pyroclastic flow deposit

Age unknown

Tanoharagawa formation

Otsukayama scoria bed

Ogi Quartz Diorite

Obara Tonalite

Geological structures

Fukuura anticline