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List of geological units in Akita prefecture

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

Photographs of geological units in Akita prefecture

Cretaceous (145.0-66.0 Ma)
Abukuma belt
Shirakamidake Granitic Complex
Akashima Formation
Nyudozaki Igneous Rocks
Akashima Lavas
Taiheizan Complex Pluton
Tertinary granites
Taiheizan Plutonometamorphic Rocks
Taiheizan Granodiorite
Haginari Granite
Nakamori Gabbro
Metamorphic rocks
Obonai Granodiorite
Kamuroyama Granites
Eocene (56.0-39.0 Ma)
Monzen Formation
Shinzan Rhyolite
Shiosenomisaki Sandstone and Conglomerate
Kenashiyama Andesite
Nagasaki Dacite
Chorakuji Basalt
Ryugashima Dacite
Butaijima Basalt
Haginari-Okuramatasawa Formation
Oligocene-Miocene
Yamauchi Formation
Yamayakawa Formation
Nishioga Group
Miocene (23.03-5.33 Ma)
Fujikuragawa Formation
Kuroishizawa Formation
Sugozaki Quartz Diorite
Onnagawa Formation
Shinzan Diatomaceous Mudstone Member
Hirasawa Diatomaceous Mudstone Member
Kamisannai Tuff Member
Aizen Basalts
Babame Dolerite
Futamata Rhyolites
Yakushiyama Basalts
Yokoyama Dacite
Innai Tuff Member
Numadate Andesite
Kabuyama Andesite
Asahimori Rhyolite
Tsukiyama Rhyolite
Nishikurosawa Formation
Daijima Formation
Nomuragawa Formation
Tateyamazaki Dacite
Honzan Vent-filling Deposit
Nomuragawa Dacite II
Nomuragawa Basalt
Nomuragawa Dacite I
Nomuragawa Tuffaceous Conglomerate
Shigenai Formation
Kagoya Formation
Yukizawa Formation
Hotakizawa Formation
Menaichizawa Formation
Okuzu Formation
Shijuyataki Basaltic Hyaloclastite Member
Akamori Tuff Breccia Member
Motoyama Volcanic Breccia Member
Uwamukai Tuff Breccia Member
Kitanomatasawa Formation
Uyashinai Mudstone Member
Shonai Tuff Member
Suwayama Dacite
Utto Formation
Torisakagawa Formation
Omata Fomration
Sugota Formation
Ukibuta Basalt Member
Hachiisan Mudstone Member
Gongenyama Formation
Hatamura Formation
Taikura Basalt Member
Ogura Welded Tuff Member
Takayakushiyama Andesite Member
Mashikozawa Welded Tuff Member
Shimizubuchi Tuff Member
Zentoku Tuff Member
Kanotsume Formation
Oyana Formation
Doroyu Formation
Kobinaizawa Formation
Fujikotogawa Formation
Iwaya Formation
Ittori Formation
Subari Andesite
Moyasan Rhyolite
Katsurabuchi Formation
Shiotezawa Formation
Hachiwari Formation
Yamaya Formation
Hayaguchigawa Formation
Tomarikawa Mudstone Member
Ichinomatazawa Basalt Member
Futatsumori Quartz Diorite
Akaishigawa Diorite Porphyrite
Noshirooki Andesite
Koyanosawa Formation
Ogata Basalt Member
Manaitayama Volcanic Rocks
Osarubegawa Formation
Kirinai Formation
Makibuchi Formation
Koani Formation
Moriyama Volcanics
Houzukiyama Dacite
Himegatake Andesite
Omoriyama Andesite
Kumazawagawa Formation
Koshitomaezawa Formation
Obonai Formation
Kunimitoge Formation
Aosawa Formation
Yashiozawakawa Formation
Zentoku Quartz Diorite
Iizawa Formation
Shigenosawa Andesite Member
Kurosawa Formation
Okawa Formation
Kamitamatagawa Volcanic Rocks
Momoyake Volcanic Rocks
Koshikiyama Dacite
Daiyama Quartz Diorites
Ozawa Body
Okuromoriyama Body
Daisenyama Formation
Sarakawa Formation
Okachigawa Formation
Minamizawa Welded Tuff Member
Yunosawagawa Formation
Oarasawa Formation
Oidegawa Formation
Nishikozawa Formation
Tozan Rhyolite Member
Miocene-Pliocene
Torakeyama Formation
Torakeyama Tuff Member
Oyu Welded Tuff Member
Minasegawa Tuff Member
Nibetsu Granite
Tsukushimori Rhyolite
Yoroibata Formation
Pliocene (5.33-2.58 Ma)
Tentokuji Formation
Tentokuji facies
Alternation facies
Katsurane facies
Haguroyama Dacites
Fukuyama Andesites
Chojayashiki Dacites
Sanzugawa Formation
Upper Member
Main Member
Breccia Member
Maeyamagawa Formation
Usuizawa Formation
Minamihirasawa Formation
Minamihirasawa Tuff
Miyata Formation
Moriyoshi Dacite
Pliocene-Pleistocene
Funakawa Formation
Upper Nanakura Tuff Member
Lower Nanakura Tuff Member
Yunokoshiyama Rhyolite
Yunosawa Rhyolites
Soyakyo Andesite
Shinzan Andesites
Yonegamori Dacite
Osanai Tuff Member
Nomura facies
Sasaoka Formation
Nishimizuguchi Formation
Pleistocene (2.58- 0.01Ma)
Shibikawa Formation
Katanishi Formation
Honnai Sand Member
Matsukizawa Sand and Gravel Member
Kakumazaki Mud Member
Tarusawa Sand Member
Anden Sand Member
Kitaura Formation
Megata volcano
Ichinomegata maar
Ninomegata maar
Sannomegata maar
I-stage volcanic product
II-stage volcanic product
Wakimoto Formation
Toga volcano products
Toga Pumic Bed
Oga Pumice Tuff
Iriai Formation
Aikawa and Kotokawa Terrace Deposit
Hakoi Formation
Tenno Formation
Takaoka Formation
Nishime Formation
Chokai volcano
Stage II
Stage IIc
Hottai Lava
Upper Akakuzurezawa Lava
Jorozawagawa Lava
Stage IIb
Odaira Lava
Torinoumi Lava
Kawafukurogawa Pyroclastic Flow Deposit
Inakuradake Lava
Kannonmori Lava
Lower Saruana Lava
Stage IIa
Osagawa Lava
Kosagawa Lava
Kawafukuroogawa Lava
Mototaki Lava
Kawafukuro Lavas
Ichinosaka Lava
Hongo Lava
Upper Nasodani Lava
Stage I
Uguisugawa Basalt
Mitake Mudflow Deposits
Okuyama Debris Avalanche Deposits
Shirayukigawa Debris Avalanche Deposits
Yurihara Debris Deposits
Ishihagegawa Volcanic Rocks
Iigamori Lava
Lower Akakuzurezawa Lava
Akakuzurezawamigimata Lava
Shunomatagawa Lava
Shimotamatagawa Lava
Upper Shimotamatagawa Lava
Mitaki Volcanic Rocks
Nasodani Lava
Torigoegawa Lava
Lower Yabitsugawa Lava
Upper Yabitsugawa Lava
Okumiyayama Dacite
Kabutoyama Pyroclastic Flow Deposit
Kijiyama Pyroclastic Flow Deposit
Takamatsudake Dacite
Kobinaiyama Andesite
Tatematazawa Formation
Nenbazawa Formation
Daira-Komagatake volcano
Daira-Komagatake Volcanic Products
Tashirodake volcano
Itazawa Lahar deposit
Hiratakizawa Lahar deposit
Central cone
Main body
Older stratovolcano
Nakazawa Formation
Kemanai Terrace Deposit
Low III Terrace Deposit, Noshiro
Low II Terrace Deposit, Noshiro
Low I Terrace Deposit, Noshiro
Middle II Terrace Deposit, Noshiro
High II Terrace Deposit, Noshiro
High I Terrace Deposit, Noshiro
Yuguruma Formation
Ishikurayama Formation
Upper Kanegasaki Terrace Deposit
Lower Kanegasaki Terrace Deposit
Kamishinzan Terrace Deposit
Shimoshinzan Terrace Deposit
Lower I Terrace Deposit, Kariwano
Middle III Terrace Deposit, Kariwano
Middle II Terrace Deposit, Kariwano
Middle I Terrace Deposit, Kariwano
Higher II Terrace Deposit, Kariwano
Higher I Terrace Deposit, Kariwano
Lower II Terrace Deposit, Yashima
Lower I Terrace Deposit, Yashima
Middle Terrace Deposit, Yashima
Higher V Terrace Deposit, Yashima
Higher IV Terrace Deposit, Yashima
Higher III Terrace Deposit, Yashima
Higher II Terrace Deposit, Yashima
Higher I Terrace Deposit, Yashima
Moriyoshi volcano
Later stage
Okudake Lava
Tachigamori Lava
Hibakuradake Lava
Bunatai Lava
Earlier stage
E-3 stage
Sudokizawa Lava Flow
Senbonsugisawa Scoria Flow Deposit
E-2 stage
Ichinomatakawa Lavas
Ichinokoshi Lavas
Todorinaisawa Lava
Animatsukurasawa Lavas
Tokidozawa Lava
E-1 stage
Tamagawa Welded Tuff
Kurasawayama Welded Tuff
Bunamoribokujo Welded Tuff
Daibutsu volcano
Kayodake volcano
Post-caldera lava
Hitsumori Lava
Parasitic cone
Eboshidake Lava
Pre-caldera stratovolcano
Kowase Altered Andesite
Shibakura volcano
Upper Shibakura Lava
Lower Shibakura Lava
Bunamori Lava
Tamagawa Welded Tuff
Ainaizawa Formation
Oshiromori Volcanic Products
Nyutozan Volcanic Products
Yumoriyama Volcanic Products
Sasamoriyama Volcanic Products
Shimotamatagawa Formation
Bosawa Andesite
Kawaiyama Dacite
Pleistocene- Holocene
Kanpu volcano
Stage 4
Tsumakoi-touge Lava
Stage 3
Tamanoike Landslide and Debris-avalanche Deposits
Takikawa Lava
Sancho Lava
Katakura Lava
Kotokawa Lava
Stage 2
Iwashimizu Lava
Urata Lava
Tarusawa Tephra
Stage 1
Iwakura Lava
Tominaga Lava
Shibikawa lava
Wakimoto lava
Yumoto Travertine
Yakeyama volcano
Onigajo Lava
Tsugamori Central Cone Lava
Kuroishimori Lava
Fukenoyu Lava
Shibukurozawa Lava
Sorinotaki Lava
Sumikawa Lava
Akita-Komagatake volcano
Post-caldera eruption stage
Northern caldera
Crater lake deposit
Katakurazawa Lava
Onamedake Lava
Onamedake Pyroclastic Cone Deposit
4th Pyroclastic Cone Deposit
Akakurazawa Pyroclastic Flow Deposit
3rd Pyroclastic Cone Deposit
2nd Pyroclastic Cone Deposit
1st Pyroclastic Cone Deposit
Southern caldera
Kodake Lava
Kodake Ejecta Deposit
Kodake Pyroclastic Cone Deposit
1970-71AD eruption products
Medake Lava
Medake Pyroclastic Cone Deposit
Minamidake Pyroclastic Cone Deposit
Syn-caldera formation stage
Yanagisawa Pumice Deposit
Obonai Pyroclastic Flow Deposit
Koiwai Pumice Deposit
Main strato cone stage
Yakiyama Lava
Oyakisuna Lava
Iwaisawa Lava
Upper Mizusawa Lava
Yokonagane Lava
Kinjuronagane Lava
Odake Lava
Owadasawa Lava
Hinokinaigawa Lava
Mizusawa Lava
Tazawakokogen Lava
Holocene (0.01-0 Ma)
Hashimoto Formation
Hachirogata Formation
Noshiro Coastal Dune
Younger Dune II
Younger Humic Soil
Younger Dune I
Older Humic Soil
Older Dune
Tenno Coastal Dune
Atoroku Formation
Lower II Terrace Deposit, Kariwano
Younger Sand Dune Deposits, Kisakata
Older Sand Dune Deposits, Kisakata
Younger Fan Deposits, Kisakata
Older Fan Deposits, Kisakata
Kisakata Formation
Kotaki Formation
Kotaki Mudflow Deposits
Chokai volcano
Stage III
Stage IIIb
Kojingatake Lava
Kisakata Debris Avalanche Deposit
Stage IIIa
Shichikosan Lava
Saruana Lava
Koyoshigawa Debris Avalanche Deposit
Shonai Sand Dunes
Towada-a tuff bed
Towada-b tuff bed
Chuzeri tuff bed
Geological structures
Shiraito fault
Shiose fault
Minamihirasawa fault
Yumoto fault
Oganaka fault
Sannotaki fault
Shionosaki fault
Nomura anticline
Onnagawa anticline
Nakamaguchi anticline
Wakimoto anticline
Kotokawa anticline
Sarukawa anticline
Futto anticline
Kotohama anticline
Onnagawa syncline
Hamamaguchi syncline
Wakimoto syncline
Yasuda syncline
Iriai syncline
Unosaki dome