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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
- Age unknown
- 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)