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List of geological units in Tochigi prefecture

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

Photographs of geological units in Tochigi prefecture

Paleozoic
Aso group
Tochigi group
Permian (298.9-252.17 Ma)
Nabeyama formation
Yamasuge member (Lower Nabeyama formation)
Karasawa member
Izuru formation
Triassic (252.17-201.3 Ma)
Adoyama formation
Magi formation
Yamizo group
Jurassic (201.3-145.0 Ma)
Ashio Belt
Kuzuu Complex, Unit 3
Kuzuu Complex, Unit 2
Kuzuu Complex, Unit 1
Karasuyama Unit
Chichibu formation
Mashiko group
Kuriyama Formation
Cretaceous (145.0-66.0 Ma)
Matsuki granites
Matsuki body
Barakura body?
Hirataki body
Sori granites
Sori body
Ashikaga body
Kanoiri body
Chuzenji volcanic rocks
Cretaceous-Paleogene
Kinugawa Granite
Paleogene
Irohazaka welded tuff bed
Miocene (23.03-5.33 Ma)
Myogazawa Formation
Nagadozaka formation
Nakagawa Group
Motegi Formation
Yamanouchi Formation
Motokozawa Formation
Motokozawa Basalt
Ichiba Formation
Kinugawa rhyolites
Kanuma group
Fukaiwa formation
Momiyama formation
Hinata formation
Hanzoyama andesite
Utsunomiya group
Ozo Formation
Oya Formation
Upper part
I Bed
II Bed
III Bed
IV Bed
V Bed
S2 Bed
Lower part
VI Bed
S3 Bed
VII Bed
S4 Bed
VIII Bed
Yokoyama Formation
Kasamatsuyama Formation
Kazamiyamada andesite
Tadokoro formation
Takashio formation
Tamada formation
Arakawa Group
Irieno Formation
Shimohanawa Tuffaceous Sandstone Member
Tanokura Formation
Asabu Sandstone Member
Hongo Sandstone Member
Ogane Formation
Yoshida Shell Bed
Upper Ogane Shell Bed
Middle Ogane Shell Bed
Lower Ogane Shell Bed
Takase Shale Member
Kobana Formation
Kamasekura Tuff Member
Mangyo Tuff Member
Upper Morita Pumice Tuff Member
Lower Morita Pumice Tuff Member
Shioya group
Sekiya formation
Kanomatazawa formation
Fukuwata formation
Ashio Rhyolitic Welded Tuff (Ashio Rhyolites)
Iwafune formation
Pliocene (5.33-2.58 Ma)
Maruyama rhyolite
Kotaki rhyolite?
Neogene-Pleistocene
Kinunumayama Lava
Nenakusayama Lava
Pleistocene (2.58- 0.01Ma)
Kawasaki group
Sakaibayashi Formation
Shiobara group (Shiobara formation)
Akagawa formation
Miyajima formation
Nakashiobara volcanic breccia
Sumaki formation
Namegawa Debris Flow Deposit
Koshin volcano
Kaneda Lava Dome
Kaneda Lava
Omanako volcano
Taro volcano
Tarosan Lava
Sannoboshi volcano
Mitsudake volcano
Mitsudake Lava
Nantai volcano
Yudonosawa Andesite
Osawa Pyroclastic Flow Deposit
Onagi Welded Tuff
Kegon Lava
Osawa Lava
Kanuma pumice bed (Akagi-Kanuma tephra, Ag-KP)
Imaichi pumice bed (Nt-IP)
Shichihonzakura pumice bed (Nt-SP)
Shirakawa Pyroclastic Flow Deposits
Tenei Pyroclastic Flow Deposit
Nishigo Pyroclastic Flow Deposit
Ashino Pyroclastic Flow Deposit
Kumado Pyroclastic Flow Deposit
Takahara volcano
Takahara volcanic rocks
Stage 7
Stage 6
Stage 5
Stage 4
Stage 3
Stage 2
Otawara Pyroclastic Flow Deposits
Shiobara-Otawara Tephra
Shiobara-Otawara Pyroclastic Flow Deposit
Upper unit
Middle unit
Lower unit
Shiobara-Otawara Surge Deposit
Shiobara-Otawara Pumice Fall Deposit
Shiobara-Tanohara Pyroclastic Flow Deposit
Shiobara-Tanohara Pyroclastic Flow Deposit a
Shiobara-Tanohara Pyroclastic Flow Deposit b
Shiobara-Tanohara Pyroclastic Flow Deposit c
Shiobara-Tanohara Pyroclastic Flow Deposit d
Shiobara-Katamata Pyroclastic Flow Deposit
Sawada Pumice Fall Deposit
Stage 1
Funaishi formation
Takao pyroclastic flow deposit
Osawa pyroclastic flow deposit
Ontake-1 tephra (Om-Pm1)
Hakone-Tokyo tephra (Hk-TP)
Aira-Tn tephra (AT)
Ogawa scoria bed
Kataoka scoria bed
Nikko volcanic rocks
Nasu volcanic rocks
Pleistocene-Holocene
Shirane volcano
Shiranesan Lava
Nantai Tephra
Holocene (0.01-0 Ma)
Omaru pyroclastic flow deposit
Chausu scoria bed
Kanto loam formation
Hoshakuji loam bed
Takaragi loam bed
Tawara loam bed
Nemoto loam bed (Tomatsuri loam bed)
Haruna-Futatsudake pumice bed (Hr-FP, Ikaho tephra)
Investigation in progress
Kuroiso pyroclastic rocks (Kuroiso volcanic breccia)
Hangetsusan welded tuff bed
Fukazawa granodiorite porphyry
Kobugahara granodiorite
Sukai adamellite
Chuzenji adamellite
Ryuzunotaki pumice flow deposit
Arasawa pumice flow deposit
Aizawa formation
Hazuru member
Takayama granites
Konsei lava (Konseiyama lava?)
Yunishigawa group
Ofujiyama debris flow deposit
Akadaki formation
Toba pumice flow deposit
Takiyama andesite (Taki andesite)
Mooka pumice bed (Mp)
Mamiana pumice bed (MS)
Nasu volcano
Hinode lava
Shirazasayama lava
Kurooyadake lava
Minamigassan lava
Nishiokura lava
Inkyokura lava
Sanbonyaridake lava
Higashiokura lava
Asahidake lava
Kumamisone lava
Wadayama volcanic breccia
Shionoyu formation
Shiobara lava
Furumachi formation
Inada granite
Hoshakuji formation
Takaragi formation
Tawara formation
Kinushima formation
Geological structures
Sekiya fault (Sekiya tectonic line)
Kuzuu thrust fault