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List of geological units in Gunma prefecture
A list of stratigraphic units, igneous bodies, and geological structures reported from Gunma prefecture, Kanto region, Honshu island, Japan.
Photographs of geological units in Gunma prefecture
- Paleozoic
- Kazekuchi Formation
- Joetsu Belt
- Katashina Belt
- Shibutsusan Ultramafic Rocks
- Kawaba Ultramafic Rocks-Metagabbros-Schist Complex
- Kawaba Metamorphic Rocks
- Iwamurotoho Ultramafic Rocks
- Carboniferous (358.9-298.9 Ma)
- Kawamo formation?
- Mugiukoji formation
- Carboniferous-Permian
- Joetsu Belt
- Tanigawadake Belt
- Tanigawadake Body, Serpentinite
- Permian (298.9-252.17 Ma)
- Joetsu Belt
- Katashina Belt
- Tokura Ophiolite
- Tanigawadake mélange
- Okura formation
- Mukuruma formation
- Kuwashiro formation
- Kurumigaito formation
- Kinshozan Quartz Diorite
- Jurassic (201.3-145.0 Ma)
- Okutone group
- Northern Chichibu Belt
- Sumaizuku Unit
- Kanozan Limestone
- Hebiki Unit
- Kamiyoshida Unit
- Kamiyoshida Subunit
- Manba Subunit
- Kashiwagi Unit
- Southern Chichibu Belt
- Otchizawa Formation
- Ashio Belt
- Omama Complex
- Kurohone-Kiryu Complex
- Iwamuro formation
- Tokurazawa Formation
- Cretaceous (145.0-66.0 Ma)
- Atokura Formation
- Shimokanoya Mudstone Member
- Nakanokaya Conglomerate Member
- Miyamuro Sandstone and Mudstone Member
- Okuwahara Sandstone Member
- Atokura Conglomerate Member
- Sori-type Granitic Rocks
- Sori Granodiorite
- Sanchu Graben
- Sanyama Formation
- Sebayashi Formation
- Ishido Formation
- Shirai Formation
- Ashio group
- Yorii Plutonometamorphic Complex
- Yotsumatayama Quartz Diorite
- Sudagai Granite
- Tadamigawa Granites
- Cretaceous-Paleogene
- Daigenta Granite
- Minakami Quartz Diorite
- Cretaceous - Paleocene
- Sanbagawa Belt
- Mikabu Unit
- South Unit
- Middle Unit
- North Unit
- Paleogene
- Okunikko rhyolites
- Sudagai granite
- Paleocene (66.0-56.0 Ma)
- Kanayama Welded Tuff (Kanayama rhyolites)
- Eocene (56.0-39.0 Ma)
- Kottateyama formation
- Neogene
- Echigozawa Porphyrite
- Doai Quartz Diorite
- Nishikuro Diorite Porphyry
- Keizuruyama Lava
- Akagine Rhyolite
- Neogene-Pleistocene
- Omeshi volcano
- Omeshi Lava
- Kenashi Lava
- Upper Myojin Lava
- Lower Myojin Lava
- Hafu Lava
- Toyooka Lava
- Kuresaka Lava
- Horaguchi Lava
- Tsubakuro Lava
- Banki Lava
- Takama Lava
- Namasu Lava
- Yodate Lava
- Matsuiwa Lava
- Yokoteyama Lava
- Hidakayama Lava
- Takaishiyama Lava
- Iozawa Metasomatic Rocks
- Miocene (23.03-5.33 Ma)
- Nagaiwa formation
- Kanohara formation
- Shimonita group (Shimonita formation)
- Annaka Group
- Itahana Formation
- Tate Tuff
- Yamaguchi Tuff
- Nakazeki Tuff
- Masudagawabashi Tuff
- Haraichi Formation
- Kitamura Tuff
- Baba Tuff
- Niwaya Formation
- Tomioka Group
- Haradajino Formation
- Obata Formation
- Kojakui-sho
- Ushibuse Formation
- Garameki Formation
- Hirosawa Conglomerate
- Yabuzuka Formation
- Midoricho Formation
- Mamioka Tuff
- Gokan formation
- Akaya formation
- Hara formation
- Kassezawa formation
- Fukiwari welded tuff bed
- Motojuku formation
- Shirasunayama welded tuff bed
- Takadayama formation
- Kirigakubo formation
- Azuma formation
- Daido formation
- Tone welded tuff bed
- Katashinagawa rhyolites (Katashina rhyolites)
- Okkai group (Okkai formation)
- Kinugawa rhyolites
- Mamioka formation
- Ozawa formation
- Yoshii formation
- Minakami Group
- Namezawa formation
- Upper Namezawa formation
- Lower Namezawa formation
- Yubara formation
- Awazawa formation
- Okura formation
- Sarugakyo group
- Fukushima formation
- Orida formation
- Higashizawa formation
- Kuryu formation
- Iizuka formation
- Negoya Formation
- Kawarahata Formation, Sawatari Formation
- Miocene-Pliocene
- Takai Volcanic Rocks
- Pliocene (5.33-2.58 Ma)
- Yokokabe Formation
- Kawarayutoge Formation
- Yanba Formation
- Kirizumi Volcano
- Yunoiri member
- Aimagawa Formation
- Akima Formation
- Upper part
- Chausuyama Welded Tuff Member
- Otogai Tuff Breccia Member
- Nagaiwa Lapilli Tuff Member
- Morikuma Volcanic Breccia Member
- Kirizumi Formation
- Dozen member
- Yunosawa member
- Usuiko member
- Kubo member
- Kogura Formation
- Myogi formation
- Kengamine formation
- Sasatoya formation
- Nagaone formation
- Iwashima formation
- Sakaue formation
- Kadokai Formation
- Kirigakubo formation
- Oze lava
- Byobuiwa formation
- Kawarayu Quartz and Granodiorite Porphyry
- Kumori Dacite
- Osaka Dacite
- Pliocene-Pleistocene
- Godo Formation
- Pleistocene (2.58- 0.01Ma)
- Agatsuma Clay
- Imai Gravels
- Koneyama Formation
- Kennomine formation
- Onogami formation
- Nenbutsudaira lava
- Nakanojo lacustrine formation
- Numata lacustrine formation
- Tsumagoi formation
- Aira-Tn pumice bed (AT)
- As-BP Tephra
- As-MP Tephra
- As-SP Tephra
- As-YP Tephra
- As-Sj Tephra
- Maebashi peat bed
- Nakanojo lahar deposit
- Omama alluvial fan deposit
- Kanto loam formation
- Lower loam formation
- Middle loam formation
- Hassaki pumice bed (HP)
- Kanuma pumice bed (KP)
- Iwajuku-I formation
- Hanamagari formation
- Nakanojo lapilli formation (JLP)
- Sugao Formation
- Ojo Formation
- Kanpo volcano
- Kanpo Volcanic Rocks
- Sugaotoge Andesite and Dacite
- Fudosawa Andesite
- Shiraiwazawa Andesite
- Azumaya volcano
- Urakurayama volcanic edifice
- Kamitokusa Lavas
- Kaminokai Lavas
- Akagawa Lavas
- Nittazawa Lavas
- Akagi Volcano
- Younger Stratovolcano
- Post-caldera stage
- Jizodake Lava
- Kono Lava
- Pumice-eruption stage
- Volcanic Fan 2 Deposit
- Garan Pyroclastic Deposit
- Nagumo Pumice Flow Deposit
- Toshimaru Pumice Flow Deposit
- Ogo Pumice Flow Deposit
- Wakubara Pumice Flow Deposit
- Fujiki Pumice Flow Deposit
- Tanashita Pumice Flow Deposit
- Fudo Pumice Flow Deposit
- Younger volcanic-cone-building stage
- Volcanic Fan 1 Deposit
- Itoi Pumice Flow Deposit
- Kurayamikubo Lavas
- Arayama Lava
- Kawaguchigawa Lava
- Nabewariyama Lava
- Funegahara Lava
- Masugatayama Lava
- Suzugatake Lava
- Nashiki Debris Avalanche Deposit
- Older Stratovolcano
- Rashirashizawa Lava
- Riheijaya Lava
- Kurobiyama Lava
- Nirezawa Lava
- Mugikubo Lava
- Haruna volcano
- Older Haruna Fan Deposits
- Miyazawa Pyroclastic Flow Deposit
- Older Haruna Volcanic Dykes
- Older Haruna Volcanic Products
- Haruna Tuff Breccia
- Younger Haruna volcano
- Hr-HP Tephra
- Shirakawa Pyroclastic Flow Deposit
- Hassaki Fall Tephra
- Harunafuji Lava
- Jagatake Lava
- Somayama Lava
- Mizusawayama Lava
- Mizusawayama Pyroclastic Flow Deposit and Talus Deposit
- Younger Haruna Volcanic Fan Deposit
- Jinba Debris Avalanche Deposit
- Asama-Eboshi volcanoes
- Stage I
- Iwayakan'non stratovolcano
- Iwayakan'non Lava
- Stage II
- Kokuzo Lava
- Kanahara Lava
- Omuro Lava
- Ofuji Lava
- Gotomiki Lava
- Eboshidake stratovolcano
- Upper Eboshidake Lava
- Iwashimizu Formation
- Narahara Lava
- Lower Eboshidake Lava
- Stage III
- Kakuma-Nabebuta stratovolcano
- Kakuma-Nabebuta volcanic products
- Yunomaru lava dome
- Yunomaru lava
- Sajikiyama lava dome
- Sajikiyama Lava
- Kosajikiyama lava dome
- Kosajikiyama Lava
- Sanpogamine stratovolcano
- Kagonotoyamakita Lava
- Sanpogaminenishi Lava
- Ikenotaira pyroclastic cone
- Takamineyama stratovolcano
- Takamineyama Lava
- Stage IV
- Murakamiyama lava dome
- Murakamiyama Lava
- Mizunoto stratovolcano
- Nishikagonotoyama lava dome
- Nishikagonotoyama Lava
- Higashikagonotoyama lava dome
- Higashikagonotoyama Lava
- Kurofu stratovolcano
- Zappa stage
- Kengamine stage (80 ka)
- Mitsuone stage
- Sennin stage
- Sekisonzan lava dome
- Koasama lava dome
- Hanareyama lava dome
- Hotokeiwa stratovolcano
- Hotokeiwa Lava
- Maekake stratovolcano
- Takatsuya stratovolcano
- Okuwa Debris Avalanche Deposit
- Tsumagoi Pyroclastic Flow Deposit
- Kusatsu-Shirane volcano
- 1st stage
- Matsuozawa volcano
- Yumiike Lava
- Komenashi Lava
- Udogasawa Lava
- Yahazudaira Lava
- Aoba Lava
- Matsuozawa Lava
- Yatoko Lava
- Shirane Tuff Breccia
- 2nd stage
- Oshi Pyroclastic Flow Deposit
- 3rd stage
- Heibeike Lava
- Sarabuseyama volcano
- Sarabuseyamanikurayama Lava
- Nikurayama volcano
- Sarabuseyamanikurayama Lava
Ayamedaira volcano
Suzugadake Lava
- Shirodake volcano
- Shirodake Lava
Mitsugamine Lava
- Kesamaru volcano
- Honkesamaru Lava
- Maekesamaru Lava
- Sukai volcano
- Sukaiyama Lava
Kaminokai Clay Beds
Miyukida Fan Deposit
Hagiu Formation
Nodono Formation
Lower Agatsuma Loam
Ata-Th Tephra
Minohara Tephra
YoP-2 Tephra
Higher Terrace Deposit, Shirasuna river
Higher Terrace Deposit, Nurukawa river
Lower Terrace Deposit, Agatsuma river
Tazawa Formation
Higher Terrace Deposit, Watarase river
Middle Terrace Deposit, Watarase river
Lower Terrace Deposit, Watarase river
Kiribara Terrace Deposit
Iwajuku Terrace Deposit
Yabuzuka Terrace Deposit
Omama Terrace Deposit
Aioi Terrace Deposit
Nippa Terrace Deposit
Ishigami Terrace Deposit
Syori Terrace Deposit
Pleistocene - Holocene
- Kusatsu-Shirane volcano
- 3rd stage
- Shirane pyroclastic cone
- Ainomine pyroclastic cone
- Motoshirane pyroclastic cone
- Yumi-ike maar
- Shirane volcano
- Keitsukasan Lava
Okkai Tephra
Holocene (0.01-0 Ma)
- Haruna volcano
- Younger Haruna volcano
- Hr-FA Tephra
- Haruna-Futatsudake-Shibukawa Pyroclastic Flow Deposit
- Haruna-Futatsudake-Shibukawa Fall Tephra
- Hr-FP Tephra
- Haruna-Futatsudake-Ikaho Pyroclastic Flow Deposit
- Haruna-Futatsudake-Ikaho Fall Tephra
- Futatsudake Lava
- Kanto loam formation
- Upper loam formation
- Asama-Eboshi volcanoes
- Onioshidashi Lava
- Kanbara Mudflow Deposit
- Oiwake Pyroclastic Flow Deposit
- Kusatsu-Shirane volcano
- 3rd stage
- Kagusa Lava
- Sessho Lava
- Motoshirane Lava
- Kumakura Pumice Bed
Hr-AA Tephra
As-C Tephra
As-B Tephra
As-A Tephra
Age unknown
Yunokuchi pumice bed (UP)
Maebashi formation
Hirosegawa formation
Wagobashi formation
Numata conglomerate formation
Hiuchigatake lava
Tadamigawa granite
Zazenyama lava
Okushiranekita lava
Okushiranechuo lava
Kono formation
Naritahara pumice bed? (RP)
Aoba lava
Geological structures
Kashiwazaki-Choshi tectonic line
Okitano-Iwayama fault