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List of geological units in Iwate prefecture

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

Photographs of geological units in Iwate prefecture

Cambrian (541-485.4 Ma)
Motai-Matsugadaira Belt
Motai Metamorphic Rocks
Sodenosawa Formation
Shimoide Formation
Kurodasuke Formation
Unoki Metamorphic Rock
Ohachimori Amphibolites
Takasunoyama Formation
Ordovician (485.4-443.4 Ma)
South Kitakami Belt
Hayachine Complex
Nakadake Serpentinite
Nakadake Body
Kasamoriyama Body
Yamayatoge Body
Kuromoriyama Amphibolite
Kagura Igneous Rocks
Nekosoko Body
Daisaku Zawa Body
Komegamorizawa Body
Kagura Body
Iwakurayama Body
Inugashirayama Body
Miyamori Complex
Ordovician-Silurian
South Kitakami Belt
Yakushigawa Formation
Silurian (443.4-419.2 Ma)
Hikami Granite
Shoboji Diorite
South Kitakami Belt
Nameirizawa Formation
Kawauchi Formation
Okuhinotsuchi Formation
Silurian-Devonian
South Kitakami Belt
Orikabetoge Formation
Shiraiwa Sandstone Mudstone Member
Ochiai Sandstone Conglomerate Member
Senjogataki Formation
Devonian (419.2-358.9 Ma)
Omori formation
South Kitakami Belt
Choanji Formation
Nakazato Formation
Ono Formation
Devonian - Carboniferous
South Kitakami Belt
Tobigamori Formation
Carboniferous (358.9-298.9 Ma)
Nedamo Belt
Nedamo Complex
Takinosawa Unit
Tateishi Conglomerate
Tsunatori Unit
Tateishi Schists
Hisadenaigawa Metamorphic Rocks
Onimaru formation
South Kitakami Belt
Karaumedate Formation
Takezawa Formation
Hikoroichi Formation
Nagaiwa Formation
Onimaru Formation
Odaira Formation
Arisu Formation
Shittakazawa Formation
Funakubo Formation
Odagoe Formation
Ozasa Formation
Nakazai Formation
Kogawa Formation
Yonesato Formation
Shiba Formation
Permian (298.9-252.17 Ma)
South Kitakami Belt
Nozuchi Formation
Uchikawame Formation
Toyoma Formation
Usuginu Formation
Usuginu Conglomerate
Kumonoueyama Formation
Sotokawame Formation
Tassobe Formation
Tochu Formation
Omoriyama Formation
Nakawada Formation
Nishikori Formation
Senmatsu Formation
Okago Formation
Shinden Formation
Higashifukakaya Formation
Ochiai Formation
Sakamotozawa Formation
Kanokura Formation
Iwahata Limestone Member
Triassic (252.17-201.3 Ma)
Kayamori group
North Kitakami Belt
Kuzumaki - Kamaishi Sub-belt
Kadoma Complex
South Kitakami Belt
Shizukawa-Hashiura Subbelt
Inai Group
Isatomae Formation
Fukkoshi Formation
Osawa Formation (Onnagawa formation)
Hiraiso Formation
Saragai Group
Chonomori Formation
Shindate Formation
Jurassic (201.3-145.0 Ma)
North Kitakami Belt
Kuzumaki - Kamaishi Sub-belt
Otori Unit
Kassenba Formation
Seki Unit
Kuzumaki Formation
Gobakubo Formation
Nakatsugawa Complex
Toyomane Formation
Kuribayashi Formation
Kamaishi Formation
Hanawa Formation
Akka - Tanohata Sub-belt
Takayashiki Unit
Tachiusu Sandstone Member
Akka Unit
Magidai Formation
Kisawahata Formation
Magisawa Formation
Koshimeguri Formation
Cretaceous (145.0-66.0 Ma)
Kitakami mountains plutonic rocks
I Zone
Omoe Body
Oura Granite
II Zone
Hashikami Granite
Tanohata Granite
Marginal facies
Hornblende gabbro
M1
M2
M3
M4
Central facies
C1
C2
C3
C4
C5
Miyako Granite
Marginal facies
Miyako type
Osawa type
Ashiharahira type
Central facies
Shimotanabe type
Yamada type
III Zone
Hiraniwa Body
Sakainokami Body
IV Zone
Hinomiko Body
Himekami granites
V Zone
Kurihashi quartz diorite
Tono Granodiorite
Goyosan Pluton
Kuroiwa type
Okuboyama type
Yoshihama type
Ys4
Ys3
Ys2
Ys1
Gabbroic rocks
Hitokabe Granite
Senmaya Tonalitic Pluton
VIa Zone
VIb Zone
Uchino Body
Orikabe Plutonic Complex
North body
Murone type
Tamogi type
Tsuwamonozawa type
Main body
Sasamori type
Orikabe type
Tokusenjo type
Tabashine Granites
Shinchitoge Gabbro
Shinchi Gabbro
Tsuyagawa Diorite
Hirota Quartz Monzonite
Kesengawa Granodiorite
Wakinosawa Granodiorite
Torigoe Granodiorite
Morioka granodiorite
South Kitakami Belt
Ofunato Subbelt
Massaki Group
Nagasaki Formation
Koyama Formation
Ofunato Group
Nagaiso Formation
Upper Hijochi Formation
Lower Hijochi Formation
Funagawara Formation
Takonoura Formation
Ryori Formation
Attari Formation
Uda dam granodiorite
Miyako Group
Hideshima Formation
Sakiyama Formation
Hiraiga Formation
Tanohata Formation
Aketo Formation
Raga Formation
Rikuchu Group
Harachiyama Formation
Omoto Formation
Yamaya Formation
Ubaishi Formation
Oyachi Body
Nekoyama Body
Ogayu Body
Kuzakai Body
Yamaya Granite
Koshizu Granite
Kuki Granite
Ichinohe Pluton
Tsukanaigawa Pluton
Hachigatsuka Body
Okubo Body
Ushigasawa Body
Tengu Body
Heromachi Body
Imoya Body
Nenekomori Granite
Kuji Group
Sawayama Formation
Kunitan Formation
Tamagawa Formation
Taneichi formation
Misaki Acidic Volcanic Rocks
Kurosaki Acidic Volcanic Rocks
Taro Granite
Kurumihata Granite
Nakasato Granite
Sotokawame Granite
Monomiyama Formation
Niitsuki Formation
Andesite-basalt Lava and Pyroclastic Rocks Member
Nagizawa Andesite Dykes
Andesitic Pyroclastic Rock Member
Cretaceous-Paleogene
Heizaki Pyroclastic Rocks
Eocene (56.0-33.9 Ma)
Jodogahama Rhyolites
Matsuhashi Rhyolite
Matsuhashi High-Mg Andesite
Nishoishi Rhyolite
Natsuyagawa Rhyolite
Futamata Rhyolite
Jodogahama Rhyolite
Kadogamiiwa Rhyolite
Hikime Dacite
Kariya Dacite
Matsuyama Rhyolite
Suzukuna Dacite
Yokozawa Dacite
Oguni Rhyolite
Chojamori Rhyolite
Tatsumarutoge Rhyolite
Kogawa Group
Oligocene (39.0-23.03 Ma)
Noda Group
Kuki Formation
Minato Formation
Oligocene-Miocene
Nisatai Formation
Miocene (23.03-5.33 Ma)
Inase Formation
Sahinai formation
Kotsunagizawa Formation
Okinazawa Basalt Member
Oishi Formation
Main member
Kawashiri Tuff Member
Oarasawa Formation
Tsunatori Formation
Suzukamogawa Formation
Takamoriyama Andesite Member
Kurosawa Formation
Hishinai Formation
Hanayama Formation
Maetsukamiyama Acidic Volcanic Rocks
Oidegawa Formation
Nishikozawa Formation
Maekawa Formation
Kosamuzawa Tuff Member
Orose Formation
Ichinonohara Tuff Member
Mizuyama Formation
Tayama formation
Iioka formation
Genbi formation
Genbi formation
Gogushi member
Shiratorigawa Group
Suenomatuyama Formation
Mainosawa Sandstone Member
Nakuidake Volcanic Rock Member
Aikawa Volcanic Rock Member
Itukamati Sandstone Member
Anausi Conglomerate Member
Kadonosawa Formation
Sikonai Siltstone Member
Tate Sandstone Member
Yotsuyaku Formation
Sukohata Siliciclastic Rock Member
Keiseitoge Volcanic Rock Member
Koiwai Mudstone Member
Matsukura Siliciclastic Rock Member
Sannohe Group
Shitazaki Formation
Kamassawa Sandstone and Siltstone Member
Kamimetoki Sandstone Member
Yanagisawa Formation
Kawaguchi Porcelanite Member
Zyumonzi Formation
Shimotomai Volcaniclastic Rock Member
Metoki Coquina Conglomerate Member
Hinosawa Conglomerate Member
Ainoyama Formation
Yabitsu formation
Masuzawa Formation
Yamatsuda Formation
Koshitomaezawa Formation
Ryukawa Formation
Kunimitoge Formation
Obonai Formation
Shimokurosawa Formation
Junijin sandstone member
Tsukumo sandstone member
Osuke formation
Jikyozan andesite
Kumazawagawa Formation
Miocene-Pliocene
Toya Formation
Karumai Pyroclastic Flow Deposit
Asakusazawa Pyroclastic Flow Deposit
Furuyashiki Pyroclastic Flow Deposit
Kubo Formation
Kamazawa Tuff Member
Minamishirasawa Formation
Pliocene (5.33-2.58 Ma)
Kitakamigawa group
Togawa formation
Odaira Formation
Yushima formation
Motohata Formation
Ariga formation
Kazawa formation
Mataki Formation
Kitamatagawa Formation
Kakkondagawa Pyroclastic Rocks
Tamasato Formation
Pliocene-Pleistocene
Kunimiyama Andesite
Quaternary
Yukiura pumice bed
Kawaguchi pumice bed
Nanashigureyama volcano
Takizawa formation
Pleistocene (2.58- 0.01Ma)
Tamagawa Welded Tuff
Shibutami Tuff Bed
Hanaizumi formation
Takakura volcano
Takakurasan Lava Series
Takakurasan 17 Lava
Takakurasan 16 Lava
Takakurasan 15 Lava
Takakurasan 14 Lava
Takakurasan 13 Lava
Takakurasan 12 Lava
Takakurasan 11 Lava
Takakurasan 10 Lava
Takakurasan 9 Lava
Takakurasan 8 Lava
Takakurasan 7 Lava
Takakurasan 6 Lava
Takakurasan 5 Lava
Takakurasan 4 Lava
Takakurasan 3 Lava
Takakurasan 2 Lava
Takakurasan 1 Lava
Takinosawa Lava Series
Takinosawa 13 Lava
Takinosawa 12 Lava
Takinosawa 11 Lava
Takinosawa 10 Lava
Takinosawa 9 Lava
Takinosawa 8 Lava
Takinosawa 7 Lava
Takinosawa 6 Lava
Takinosawa 5 Lava
Takinosawa 4 Lava
Takinosawa 3 Lava
Takinosawa 2 Lava
Takinosawa 1 Lava
Hayawatari Terrace Deposit
Mukokawara Terrace Deposit
Esashika Terrace Deposit
Kusagi Terrace Deposit
Asanai Terrace Deposit
Nanashigure Volcanic Fan Deposit
Kanegasawa Formation
Minashi Formation
Hirono Formation
Towada T-6 Tephra
Toya Tuff
Towada Sc2 Tephra
Towada Kasutera Tephra
Towada Aosuji Tephra
Towada T-17 Tephra
Towada QP Tephra
Towada Hachinohe Fall Tephra
Towada Nanbu Tephra
Takadate Tephra Group
Matsukawa Andesite
Kayodake volcano
Post-caldera lava
Central Cone Lava
Parasitic cone
Eboshidake Lava
Yasumori Lava
Pre-caldera stratovolcano
Maego Lava
Okuro Lava
Akazawa Lava
Kojiromoriyama Volcanic Products
Nyutosan Volcanic Products
Zarumoriyama Volcanic Products
Yumoriyama Volcanic Products
Sankakuyamakita Stratovolcano Products
Sankakuyama Lava Dome
Taigakurayama Volcanic Products
Takakurayama Volcanic Products
Yakeishidake volcano
Kurikomayama volcano
Isawagawa Fan Deposit
Umekami Formation
Pleistocene - Holocene
Iwate volcanic group
Iwate volcano
West-Iwate volcano
Okama Lava
Onawashiro Lava
Yakirizawa Lava
Ubakura Lava
East-Iwate volcano
Hirakasa Debris Avalanche Deposit
Ippongihara Debris Avalanche Deposit
Komatsukuramori Lava
Arinezawa Lava
Koiwai Mudflow Deposit
Yakehashiri lava
Matsuo debris flow deposit
Ubayashiki debris flow deposit
Shizukuishi debris flow deposit
Gohyakumori pyroclastic flow deposit
Matsukawa lahar deposit
Oishiwatari debris flow deposit
Aoyamacho lahr deposit
Marumori volcano
Futatsumori Lava
Marumori Lava Dome
Kamikura Lava
Omatsukura volcano
Omatsukura Lava
Lower Omatsukura Lava
1162.3m-yama Lava
Inukura volcano
Inukura Debris Flow Deposit
Inukura Lava
Wakare Roam Formation
W1 Unit
Iwate-Kariya Scoria
Iw-ph1 Tephra
W2 Unit
W2a Unit
Iwate-Okawakaitaku Tephra
Iw-ph2 Tephra
W2b Unit
Iwate-Shirishida Scoria
W3 Unit
To-a Tephra
W4 Unit
W4a Unit
AK-1 Tephra
Iwate-Fudotai Tephra
W4b Unit
Iwate-Oide Scoria
Iw-ph3 Tephra
Iw-ph4 Tephra
W5 Unit
Iw-W5 Tephra
W6 Unit
W6a Unit
Iw-W6a Tephra
Iw-ph5 Tephra
W6b Unit
Iw-W6b Tephra
W6c Unit
Iw-W6c Tephra
Iw-ph6 Tephra
W6d Unit
Iw-W6d Tephra
W6e Unit
Iw-ph7 Tephra
W7 Unit
W7a Unit
Iw-W7a Tephra
W7b Unit
Iwate-Suko Scoria
Iw-ph8 Tephra
W8 Unit
W8a Unit
Iw-W8a Tephra
Iw-ph9 Tephra
Iw-ph10 Tephra
Yunosawa pyroclastic deposit
W8b Unit
Iw-W8b Tephra
Iw-ph11 Tephra
W9 Unit
Iw-W9 Tephra
Iw-ph12 Tephra
W10 Unit
W11 Unit
W12 Unit
W13 Unit
W14 Unit
W15 Unit
Ippongi Lapilli Member
Yanagisawa Pumice Deposit
Koiwai Pumice Deposit
K1P
K2P
K3P
Horikiri Pumice Deposit
Mitsuishisan Volcanic Products
Ibonai Terrace Deposit
Rendaino Terrace Deposit
Oritumedake Fan Deposit
Horino Terrace Deposit
Maisawa Terrace Deposit
Hachimantai volcanic group
Obukadake volcano
Obukadake Lava
Kensomori Lava
1,384m-yama Lava
Yasemori Lava
Chausudake volcano
Maemoriyama Lava
Iwahatayama Lava
Chausudake Lava
Onagane Lava
Oyachi Lava
Daikokumori Agglomerate
Marumori Tuff
Lower Onagane Lava
Ishiyama Lava
Kamotayamagairinzan Lava
Hachimantai volcano
Appidakechienosawa Lava
Gentamori Lava
Appidake Lava
Hachimantai Lava
Mokkodake Lava
Hachimantai-Nishikabu Lava
Kuragata Lava
Yudamatagawa Lava
Komonomori Agglomerate
Holocene (0.01-0 Ma)
Hayasaka Pumice Deposit
Akka Volcanic Ash
Investigation in progress
Tsubonosawa metamorphic rocks (Tsubonosawa gneiss
Geological structures
Hayachine tectonic belt