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List of geological units in Yamagata prefecture

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

Photographs of geological units in Yamagata prefecture

Mesozoic
Tagawa acidic rock
Nihonkoku mylonite (Nihonkoku gneiss)
Jurassic (201.3-145.0 Ma)
Ashio Belt
Eboshiyama Formation
Hakonokuchi Formation
Cretaceous-Paleogene
Eburisashidake Granodiorite
Iidesan Granodiorite
Paleogene
Yunohama Granite
Paleocene (66.0-56.0 Ma)
Mokariyama Granodiorite
Miocene (23.03-5.33 Ma)
Tobishima Formation
T4 member
T3 member
T2 member
T1 member
Okawa Formation
Ishifutagarisawa Mudstone Member
Aosawa Formation
Junitaki Acid Volcanic Rock
Taizoyama Andesite
Hachimori Andesite
Omatagawa Mudstone Member
Kusanagi Formation
Takasaka Acid Volcanic Rock
Kamikomata Sandstone and Conglomerate Member
Kamitamatagawa Volcanic Rocks
Momoyake Volcanic Rocks
Onnagawa Formation
Kabuyama Andesite
Daiyama Quartz Diorites
Daiyama Body
Kuromori Body
Hosawa Body
Kitamata Formation
Oyama Formation
Zempoji Formation
Shorenji Dolerite
Atsumi Group
Irakawa Formation
Atsumidake Formation
Aburato Formation
Yamairagawa Formation
Hitokasumi Formation
Gassan formation
Tachiyazawa Formation
Sanzugawa Formation
Kamabuchi Formation
Sekizawa Tuff Member
Kuriyazawa Sandstone Member
Awanotaki Tuff Breccia Member
Ushirokawa Tuff Breccia Member
Hasshikidai Mudstone Member
Haruki Tuff Breccia Member
Manaitayama Andesites
Shimotakadoyama Andesites
Otaki Formation
Kuromori Tuff Breccia Member
Hasshikidaigawa Andesites
Otaki Mudstone and Tuff Member
Kagamizawa Mudstone Member
Kozemi Tuff and Mudstone Member
Nakada Tuff and Mudstone Member
Otaki Dolerites
Takadoyama Andesites
Yakushisan Andesites
Kaneyama Formation
Iritamo Rhyolites
Gabasawa Tuff Member
Taya Tuff Member
Ryubasan Andesites
Kyunozoki Tuff Member
Sotosawa Mudstone Member
Shunezaka Sandstone and Conglomerate Member
Tateoka Tuff Breccia Member
Torakeyama Formation
Nozoki Formation
Hokizawa Tuff Breccia Member
Sugisawa Tuff Breccia Member
Akakura Tuff Member
Nakanomata Tuff Breccia Member
Kawaiyama Dacite
Semi formation
Oinosawa formation
Hozawa formation
Ryugatake formation
Nekozawa formation
Oisawa formation
Taro formation
Niijukutoge formation
Koarasawa formation
Tsunakigawa formation
Nezugaseki formation
Tsunokawa formation
Hibarasawa formation
Nagao formation
Yanagisawa formation
Narisawa formation
Hondoji formation
Tsukiyamazawa member
Hondoji member
Mizusawa formation
Sachiu member
Mizusawa member
Ishikura member
Mazawa formation
Mazawa member
Yagisawa member
Yoshino formation
Kaminoyama formation
Motosawa formation
Akayama formation
Oguni formation
Osawa formation
Furukuchi Formation
Haruki member
Ginzan formation
Motai member
Kaminohata member
Nakajima formation
Yamadera formation
Yamaguchi formation
Hongo formation
Oya member
Kuzusawa member
Hashikami member
Juhassai member
Inazawayama member
Dorobu formation
Akayu formation
Upper member
Lower member
Wada formation
Utsutoge Formation
Yugoya Formation
Numazawa Formation
Myozawabashi Formation
Myozawagawa Tuff Member
Meganebashi Formation
Kitaoguni Formation
Odaira Formation
Itaya caldera
Itaya Formation
Kanaikezan formation
Oya formation
Mogami Group
Kodaira Formation
Aramachi Formation
Fukazawa Formation
Toyotateyama Agglomerate
Miocene-Pliocene
Takamine Formation
Noguchi Formation
Mamurogawa Formation
Hiraoka Sandstone and Tuff Member
Takasawa Sandstone Member
Oishikawa Sandstone Member
Pliocene (5.33-2.58 Ma)
Tateyama Formation
Tazawa Tuff
Maruyama Formation
Kannonji Formation
Shinazawa formation
Nakawatari Formation
Sakekawa Formation
Yamuke Formation
Motoaikai Formation
Kanaguchi Sandstone Member
Kawaguchi Coal-bearing Member
Ashizawa Formation
Hanesawa Formation
Shinjo Group
Oriwatari Formation
Waraguchi Formation
Obayashi Formation
Funagata Group
Funagata Formation
Otoge caldera
Otoge Formation
Saitsu Pyroclastic Flow Deposit
Hachimoriyama Formation
Hayama volcano
Sankichiyama volcano
Shozawa formation?
Aterazawa member
Inezawayama member
Tenoko Formation
Nakahara Formation
Shibakurayama formation
K3 tuff bed
K4 tuff bed
Koyasawa Pyroclastic Flow Deposit
Pliocene-Pleistocene
Akakura caldera
Jozenji Formation
Pleistocene (2.58- 0.01Ma)
Akakura Caldera Fill Deposit
Kannodai Formation
Ohayama Formation
Fukizawa Formation
Shonai Group
Tsukidate formation
Shirataka volcano
Hitohane Formation
Mitsuzawa formation
Onikobeiketsuki pyroclastic flow deposit
Onikobeiketsuki tephra
Kitayama formation
Nakayama formation
Yamaya Formation
Takashimizu pumice bed?
Sanbekisuki tephra
Dokusawa tephra
Mukaimachi caldera
Onikobe caldera
Naruko caldera
Nukatsukayama andesite
Myojinyama andesite
Gassan volcano
Amemoriyama lava
Yumiharidaira lava
Yudono lava
Koki pyroclastic flow deposit
Nakadai lava
Midagahara lava
Tainaiiwa lava
Busshoike lava
Shinsenike lava?
Ubagatake lava
Higashifudaraku lava
Fudaraku lava
Gassan lava dome
Zao volcano
1st stage volcanic product
2nd stage volcanic product
3rd stage volcanic product
New debris flow deposit
Old debris flow deposit
Aira-Tn tuff bed
Chokai volcano
Stage III
Stage IIIa
Nabemori Lava
Stage II
Stage IIc
Jorozawagawa Lava
Senjadani Lava
Hachimori Lava
Minaminokomai Lava
Lower Senjogahara Lava
Upper Senjogahara Lava
Senjogahara Scoria
Sensumori Lava
Stage IIb
Fukura Lava
Minowa Lava
Odaira Lava
Odairakita Lava
Torinoumi Lava
Shimizu Lava
Stage IIa
Kanamatazawa Lava
Gassanmori Lava
Ushiwatarigawa Lava
Takibuchigawa Lava
Kitaorigawa Lava
Higashiyama Pyroclastic Flow Deposit
Karasawa Lava
Shogatake Lava
Araizawagawa Lava
Stage I
Tengumori Volcaniclastic Rocks
Uenodai Lava
Shirasawagawa Lava
Owarabi Debris Avalanche Deposit
Lower Kanomatagawa Lava
Upper Kanomatagawa Lava
Kusatsugawa Debris Avalanche Deposit
Odaino Pyroclastic Flow Deposit
Upper Odaino Lava
Horaisan Volcanic Rocks
Gakkogawa Lava
Fujikuragawa Lava
Mitsunomata Lavas
Hinoso Volcanic Rocks
Lower Shogatake Lava
Lower Araizawagawa Lava
Azuma volcano
Nakadaiten-Higashidaiten volcano
Odaira Pyroclastic Flow Deposit
Lower I Terrace Deposits, Tamagawa river
Lower II Terrace Deposits, Tamagawa river
Middle I Terrace Deposit, Shirakawa river
Middle II Terrace Deposit, Shirakawa river
Lower I Terrace Deposit, Shirakawa river
Lower II Terrace Deposit, Shirakawa river
Middle Terrace Deposit, Shirabu pass
Pleistocene-Holocene
Higher Terrace Deposit, Shonai
Middle Terrace Deposit, Shonai
Lower Terrace Deposit, Shonai
Higher I Terrace Deposit, Shinjo
Higher II Terrace Deposit, Shinjo
Middle Terrace Deposit, Shinjo
Lower I Terrace Deposit, Shinjo
Lower I Terrace Deposit, Shinjo
Holocene (0.01-0 Ma)
Shonai Sand Dunes
New dune
Black sand
Old dune
Obanazawa-Hijiori tephra
Chokai volcano
Stage III
Stage IIIb
Kojingatake Lava
Shinzan Lava
Kisakata Debris Avalanche Deposit
Stage IIIa
Nabemori Lava
Saruana Lava
Terrace deposits, Tobishima
Chokai volcano
Stage III
Stage IIIa
Nabemori Lava
Mansukemichi Lava
Older Sand Dune Deposits, Kisakata
Lower III Terrace Deposits, Tamagawa river
Investigation in progress
Sabane formation
Nishiyama formation
Kubote lacustrine deposit
Sukawa lahar deposit
Zaoonsen lahar deposit
Ringo mylonite (Tanakura tectonic line)
Kotaki hyaloclastite
Hataya lahar deposit
Geological structures
Sakekawa fault
Yunosawa fault
Nagaibonchiseien fault (inferred)
Aosawa faults
Sakata thrust fault
Yamagatabonchiseien tectonic line
Tominami anticline
Tomita syncline (Ashizawa syncline)