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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
Hebiki Unit
Kamiyoshida Unit
Kamiyoshida Subunit
Manba Subunit
Kashiwagi Unit
Southern Chichibu Belt
Occhizawa 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 granite
Sanchu group (Sanchu graben)
Sanyama formation
Sebayashi formation
Ishido formation
Ashio group
Yorii Plutonometamorphic Complex
Yotsumatayama Body
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
Eocene (56.0-39.0 Ma)
Kottateyama formation
Kanayama welded tuff bed (Kanayama rhyolites)
Neogene
Echigozawa Porphyrite
Doai Quartz Diorite
Nishikuro Diorite Porphyry
Keizuruyama Lava
Miocene (23.03-5.33 Ma)
Nagaiwa formation
Kanohara formation
Shimonita group (Shimonita formation)
Annaka Group
Itahana Formation
Niwaya Formation
Haraichi Formation
Tomioka Group
Haradajino Formation
Obata Formation
Kojakui-sho
Ushibuse Formation
Gokan formation
Akaya formation
Hara formation
Kassezawa formation
Yabutsuka formation
Godo 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
Kirizumi formation
Dozen member
Yunosawa member
Usuiko member
Kubo member
Akima formation
Odogai member
Nagaiwa member
Morikuma member
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
Pliocene (5.33-2.58 Ma)
Yokokabe Formation
Kawarayutoge Formation
Yanba Formation
Kirizumi formation
Yunoiri member
Akima formation
Chojakubo member
Aiyoshi member
Chausuyama member
Myogi formation
Kengamine formation
Aimagawa formation
Sasatoya formation
Nagaone formation
Iwashima formation
Sakaue formation
Kadogai formation
Kirigakubo formation
Oze lava
Byobuiwa formation
Kawarayu Quartz and Granodiorite Porphyry
Kumori Dacite
Osaka Dacite
Neogene-Pleistocene
Hidakayama Lava
Takaishiyama Lava
Iozawa Metasomatic Rocks
Pleistocene (2.58- 0.01Ma)
Kennomine formation
Onogami formation
Nenbutsudaira lava
Nakanojo lacustrine formation
Numata lacustrine formation
Tsumagoi formation
Aira-Tn pumice bed (AT)
Muroda pumice bed (MP)
Itahana Brown tuff bed (BP, Itahana Brown pumice bed, Iwajuku-II formation)
Itahana Yellow pumice bed (YP)
Maebashi peat bed
Motosoja lahar deposit
Shiraito pumice 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 Formation
Sugaotoge Andesite and Dacite
Fudosawa Andesite
Shiraiwazawa Andesite
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
Itoi Pumice Flow Deposit
Fudo Pumice Flow Deposit
Volcanic Fan 1 Deposit
Younger volcanic-cone-building stage
Kurayamikubo Lavas
Arayama Lava
Kawaguchigawa Lava
Nabewariyama Lava
Funegahara Lava
Masugatayama Lava
Suzugatake Lava
Nashiki Debris Flow Deposit
Older Stratovolcano
Rashirashizawa Lava
Riheijaya Lava
Kurobiyama Lava
Asamayama volcano
Hotokeiwa lava
Okuwa Debris Avalanche Deposit, Maebashi Mudflow 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
Maekake stratovolcano
Takatsuya stratovolcano
Kusatsu-Shirane volcano
1st stage
Matsuozawa volcano
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
Sukai volcano
Sukaiyama Lava
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)
Hr-FP Tephra
Kanto loam formation
Upper loam formation
Kanbara pyroclastic flow deposit
Asamayama volcano
Onioshidashi lava
Kusatsu-Shirane volcano
3rd stage
Kagusa Lava
Sessho Lava
Kumakura Pumice Bed
Investigation in progress
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