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List of geological units in Hokkaido prefecture

A list of stratigraphic units, igneous bodies, and geological structures reported from Hokkaido, Japan.

Photographs of geological units in Hokkaido prefecture

Jurassic (201.3-145.0 Ma)
Matsumae group
Rawan group
Sorachi-Yezo Belt
Sorachi group
Yamabe formation
Jurassic-Cretaceous
Oshima Belt
Okamotsugawa Complex
Daisengendake Complex
Esashi Complex
Namezawa Unit
Shimonosawa Unit
Kamiiso Complex
Raidenyama Unit
Hekirichigawa Unit
Toi Complex
Karakawa Unit
Shirikishinai Unit
Sorachi-Yezo Belt
Kamuikotan Metamorphic Rocks
Kamuikotan Complex
Horokanai Unit
Tokiwayama Serpentine Mélange
Biei Unit
Harushinai Unit
Penkehoronai Unit
Sorachi Group
Shibunnai formation
S1
Usubetsu formation
Towa complex
Toma complex
Toma formation
Shirikomadake mélange
Cretaceous (145.0-66.0 Ma)
Oshima Belt
Rebun Group
Rebundake formation
Nairo formation
Amana formation
Uennai formation
Jizoiwa formation
Sorachi-Yezo Belt
Kamuikotan Metamorphic Rocks
Iwashimizu Complex
Mikawa Unit
Pirashuke Unit
Futagawa Unit
Shizunai Unit
Poroshiri Ophiolite
western Uenzaru-Pankenuushi Body
Tottabetsu Body
Oku-Niikappu Body
Koibokushushibichari Body
Horokanai Ophiolite
Idonnappu Belt
Naizawa Complex
Okuniikappu Complex
Horobetsugawa Complex
Sorachi Group
Shuyubari formation
Naegawa chert formation
Shirikishimanai Formation
S2
S3
Naegawa Dolerite
Pechikunnai Formation
Chiroro Formation
Nitarachi Formation
Yezo Group
Osoushinai Formation
Omagari Formation
Omagari carbonate islet
Nishichirashinai Formation
Sakugawa Formation
Sakotandake Formation
Shirataki Formation
Honeishi formation
Moehoro Formation
Kamiji Formation
Tomitoi Formation
Nagareya Formation
Haborogawa Formation
Upper Haborogawa Formation
Tsukimi Sandstone Member
Middle Haborogawa Formation
Lower Haborogawa Formation
Uk
Ui-j
Uh
Ug
Ud-f
Ub-c
Ua
Mikasa Formation
Kashima Formation
Unit 3
Tomiuchibashi Tuff Member
Unit 2
Unit 1
Saku Formation
Hakkin Muddy Sandstone Member
Hikagenosawa Formation
Kanajiri Sandstone Member
Yunosawa Sandstone Member
Maruyama Formation
Shuparogawa Formation
Okusakainosawa Sandstone and Mudstone Member
Kirigishiyama Olistostrome Member
Refureppu Sandstone Member
Soashibetsugawa Formation
Pankeushappugawa Formation
Horonaizawa Formation
Soshubetsugawa Formation
Niikappugawa Formation
Shunbetsugawa Formation
Kamiabukasanbezawa Formation
Momokarigawa Formation
Mitsuishigawa Formation
Horobetsu Formation
Chinomigawa Formation
Urakawa Formation
Efue Formation
Utafue Formation
Becchari Formation
Tsukenai Formation
Onodera formation
Shimanoshita formation
Abukasanbe Mélange
Hidaka Belt
Hidaka Supergroup
Pechan group
Poronupuri formation
Kaimei formation
Aibetsu formation
Horoka formation
Yubetsugawa formaton
Tokoro Belt
Saroma Group
Nikoro Group
Kumaneshiri group
Urausuyama formation
Monai volcanics
Inaushi formation
Yusenkyo formation
Yubetsu group
Mukaiengaru formation
Omisaki formation
Orannai formation
Ichannai formation
Usotan group
Utanobori group
Tonbetsu group
Yasukawa group
Kariwakegawa formation
Shimokawa greenstones
Cretaceous-Paleocene
Sorachi-Yezo Belt
Yezo Group
Hakobuchi Formation
Sorachi group
Tomamu diabasic rock
Kamui group
Yubetsu group
Cretaceous-Paleocene-Eocene
Nemuro Belt
Nemuro Group
Tomikawa Formation
Tokomuro Sandy Siltstone Member
Katsuhira Mudstone Member
Tomikawa Sandstone and Conglomerate Member
Kawaruppu Formation
Upper Mudstone Member
Lower Mudstone Member
Kawakami Formation
Kiritappu formation
Tokotan formation
Akkeshi formation
Shiomi formation
Hamanaka formation
Oborogawa formation
Monshizu formation
Otamura formation
Nokkamappu formation
Katsuhira formation
Paleogene
Rakko formation
Onabetsu formation
Paleocene (66.0-56.0 Ma)
Hidaka Belt
Hidaka Supergroup
Nakanokawa Group
Northern Unit
Oda Mélange
Satsunaigawa Formaiton
Southern Unit
Hiroo Complex
Paleocene-Eocene
Hidaka Belt
Hidaka Supergroup
Nakanokawa Group
Northern Unit
Yaoromappugawa Formation
Eocene (56.0-39.0 Ma)
Hidaka Belt
Hidaka Supergroup
Nakanokawa Group
Northern Unit
Sakashita Formation
Bisei Formation
Southern Unit
Kamitoyoni Formation
Erimo Complex
Kabato formation
Ishikari Group
Ashibetsu Formation
Hiragishi Formation
Ikushunbetsu Formation
Akabira Formation
Bibai Formation
Wakanabe Formation
Yubari Formation
Horokabetsu Formation
Noborikawa Formation
Takane Formation
Rikubetsu formation
Sakaemori formation
Urahoro Formation
Shakubetsu Formation
Rushin Formation
Shitakara Formation
Yubetsu Formation
Soun Formation
Yubetsuhon Formation
Junishaku Formation
Tenneru Formation
Harutori Formation
Beppo Formation
Haboro Formation
Sankebetsu Formation
Lower
Uryu group
Shiraki formation
Uryu formation
Owada formation
Tappu group
"Toranokawa formation"
Rurochi formation
Poronai Group
Poronai Formation
Eocene-Oligocene
Hidaka Belt
Hidaka Metamorphic Belt
Hidaka Metamorphic Rocks
Upper metamorphics
Oligocene (39.0-23.03 Ma)
Hidaka Belt
Hidaka Metamorphic Belt
Hidaka Plutonic Rocks
Upper granitoids
Nupinai Granite
Middle tonalite
Rakkodake Body
Toyonidake Body
Gabbros
Oshirabetsu Body
Jozankei Group
Shiromizugawa formation
Kayanuma formation
Poronai Group
Momijiyama Formation
Jusanmairu Sandstone Member
Minami-naganuma Formation
Erimo formation
Utaro conglomerate
Matahachizawa formation
Bushigawa formation
Onbetsu Group
Nuibetsu Formation
Charo formation
Omagari formation
Kawakami group
Morawan formation
Honbetsuzawa formation
Wakamatsuzawa formation
Futamata andesites
Okuhonbetsu formation
Kamicharo formation
Fuppushinai formation
Tokoro formation
Hidaka Belt
Hidaka Supergroup
Uenshiri Formation
Magarifuchi formation
Utsunai formation
Matahachi formation
Oligocene-Miocene
Hidaka Belt
Hidaka Metamorphic Belt
Hidaka Plutonic Rocks
Upper granitoids
Middle tonalite
Lower tonalite
Basal tonalite
Gabbros
Opirarukaomappu Body
Niobetsu Body
Ultramafic rocks
Tsubetsu group
Takkobu formation
Tsubetsu formation
Kawakami group
Kiroro formation
Atsunai group
Shiranuka foramtion
Atsunai formation
Chokubetsu formation
Okoppezawa formation (Ishiizawa formation)
Tokiwa formation
Chiraikaribetsu formation
Neogene
Rusha formation
Assabu formation
Miocene (23.03-5.33 Ma)
Hidaka Belt
Hidaka Metamorphic Belt
Hidaka Metamorphic Rocks
Lower metamorphics
Hidaka Plutonic Rocks
Okushibetsu Plutonic Complex
Nissho Toge Granite Complex
Memurodake Gabbro/Diorite Complex
Pankenushi Gabbro Complex
Magarisawa Tonalite
Ultramafic rocks
eastern Uenzaru-Pankenuushi Body
Menashunbetsu Body
Horoman Body
Nikanbetsu Body
Tottabetsu Body
Kamuiekuuchikaushi Body
Nozukadake Granite
Mourai formation
Hakkenzan andesite
Misumai andesite
Toyama group
Upper
Middle
Lower
Jozankei group
Shiraigawa formation
Toyoha group = Jozankei group?
Yuhizawa Formation
Otarunaigawa Formation
Takinosawa formation
Shiraigawa formation
Akaiwa Formation
Kayashiba Formation
Takashima Formation
Hariusu Formation
Oshoro Formation
Shioya Formation
Ichibangawa formation
Subetsu formation
Ponsubetsu Formation
Raunenai Formation
Aoyama Basalt
Wakkanai Formation
Masuporo Formation
Onishibetsu Formation
Soya Coal-bearing Formation
Higashino Formation
Kinkomanai Formation
Chepotsunai Formation
Kotanbetsu Formation
Chikubetsu Formation
Oiwake Formation
Iwamizawa Formation
Kawabata Formation
Higashiyama Sandstone and Conglomerate Member
Amagiri Sandstone and Mudstone Member
Takinoue Formation
Niniu Group
Fureoi Formation
Karumai Formation
Nibutani Formation
Abetsu Formation
Sakae Formation
Motoyama Formation
Motokanbe Formation
Ukekoi Formation
Furanui Formation
Shizunai Formation
Azamizawa Formation
Nishikawa Formation
Shunbetsu Formation
Noya Formation
Kamikineusu Formation
Okishinai dike swarm
Okumobetsu volcanic breccia
Churui formation
Nukamappu volcanic breccia
Koshikawa foramtion
Kanayama basalt
Yakumo formation
Oanzaigawa formation
Kikonai formation
Fukuyama formation
Akahage member
Tsurikake formation
Hidarimatagawa formation
Babagawa formation
Kunnui formation
Tokachihoroka formation
Taushubetsu formation
Kiroro formation
Nisho formation
Nupinai formation
Odamura formation
Toyonigawa formation
Atsunai group
Chichappu formation
Tonokita formation
Yokoyama formation
Kurumatomanai Formation
Abashiri Formation
Masuura Formation
Notoro Formation
Yobito Formation
Kucchan group
Bannosawa formation
Ranshima formation
Nishitoppu group
Wakkauenbetsu formation
Sotsuchi formation
Yakeyama formation
Asahi formation
Umaoi formation
Yuni formation
Osokinai formation
Shintotsukawa group
Mashike formation
Toppu formation
Togeshita formation
Rokugosenzawa formation
Maedanosawa formation
Rumoi formation
Kuriyama formation
Sankebetsu formation
Upper
Motochi formation
Meshikuni Formation
Kushuko Dolerite
Hamanaka formation
Minatomachi Formation
Oshidomari Formation
Horoshin formation (Yudoro formation)
Fukuroji formation
Jugosenzawa formation
Onishika fossil bed
Ofuntarumanai formation
Tachikaraushinai formation
Tokushibetsu agglomerate
Shibiutan formation
Furubira group
Kozawa formation
Yamato formation
Kunitomi formation
Inaho formation
Riyamunai formation
Hannokizawa formation
Okushibetsu formation
Sanru formation
Bifuka formation
Tawaramappu formation
Peipanyama lava
Kamishiyubetsu formation
Oshiraneppugawa formation
Shokotsudake welded tuff bed
Konomai formation
Mobetsu formation
Tomeoka formation
Shanafuchi formation
Atsuta formation
Bannosawa formation
Yasosuke agglomerate
Occhube complex
Inashibetsu lava
Kenbuchi formation
Ichinohashi granite
Kamihoronai lava
Numadake lava
Piyashiriyama lava
Ishizaki rhyolites
Esashi formation
Kohan formation
Kanayamazawa formation
Hiratori formation
Shionosawa formation
Hattari formation
Toyama group
Itawarizawa formation
Masunosawa formation
Asari Group
Yamazawa formation
Tokiwa formation
Okuteineyama Lava
Kaunnai Formation
Panke Formation
Soyamisaki Basalt
Toberi Formation
Rekifune Volcanic Rocks
Meguro Porphyrite
Urakawa Lamprophyre
Samani Porphyrite
Pinneshiri-dake Lava
Otaru Formation
Onenai Formation
Miocene-Pliocene
Nina Formation
Kamisato group
Satomi formation
Mito formation
Koetoi Formation
Enbetsu Formation
Atusga Formation
Taiki Formation
Pliocene (5.33-2.58 Ma)
Teine volcano
Teineyama Lava
Upper
Middle
Lower
Nishino Formation
Tobetsu formation
Ikushina formation
Kuromatsunai formation
Yoneoka formation
Ainuma volcanic rocks
Tokachi Group
Ikeda Formation
Biribetsu coal-bearing memeber
Nukanai Formation
Ikeda Group
Lower
Upper Lignite-bearing Member
Sarubetsu Tuff Member
Lower Lignite-bearing Member
Inashibetsu Tuff Member
Honbetsu formation
Akan group
Soushi formation
Kotan formation
Komahata formation
Urahorozaka tuff member
Chippudomari formation
Kushiro Group
Tokotan Formation
Misaki Formatoin
Zanpin formation (?)
Rikushibetsu formation
Moebetsu formation
Mukawa formation
Atsukarushinai formation
Fukagawa group
Bibaushi formation
Ichinosawa formation
Horokaoshirarika formation
Ebeotsu formation
Inadazawa formation
Samebuchi formation
Horokura formation
Chippubetsu formation
Ichiyan formation
Takigawa formation
Minenobu formation
Kiyomappu formation
Mochikubetsu formation
Honhorobetsu formation
Shotonbetsu formation
Nakatonbetsu formation
Kawanishi formation
Ugetsuzawa welded tuff bed
Horokayubetsu formation (Horokayubetsu welded tuff bed)
Horo formation
Ishiyama formation
Noboribetsu volcano
Tachibanaike lava
Raibayama lava
Yoichi formation
Tomarugawa Formation
Pliocene-Pleistocene
Teineyama Debris Avalanche Deposit
Tate formation
Makomanai formation
Yuchi Formation
Quaternary
Nisshin formation
Pleistocene (2.58- 0.01Ma)
Kutcharo volcano
Furume Welded Tuff
Kutcharo Tephra
KpI (Kutcharo Pumice Flow Deposit I
KpII (Kutcharo Pumice Flow Deposit II
KpIII (Kutcharo Pumice Flow Deposit III
KpIV (Kutcharo Pumice Flow Deposit IV
KpV (Kutcharo Pumice Flow Deposit V
KpVI (Kutcharo Pumice Flow Deposit VI
KpVII (Kutcharo Pumice Flow Deposit VII
KpVIII (Kutcharo Pumice Flow Deposit VIII
Post-Kutcharo caldera volcanoes
Mashu volcano
Stratovolcano building stage
Ma-α
Ma-β
Ma-γ
Ma-δ
Ma-ε
Ma-ζ
Nakajima volcano
Atosanupuri volcano
Older Atosanupuri Volcano
Atosanupuri Somma Lava
Oyakkotsu Lava Dome
Atosanupuri Pyroclastic Flow Deposit
Lower Mashu Tephra Formation
Ml-a
Ml-b
Ml-c
Ml-d
Ml-e
Chanai Tephra Formation
Ch-a
Ch-a1
Ch-a2
Ch-b
Ch-b1
Ch-b2
Ch-c
Ch-d
Ch-d4
MidK-1
MidK-2
MidK-3
MidK-4
MidK-5
LowK-Sc
Upper Nakashumbetsu Tephra Formation
Nu-a
Nu-b
Nu-c
Nu-d
Nu-e
Nu-e1
Nu-e2
Nu-f
Nu-g
Nu-g1
Nu-g2
Nu-h
Nu-h1
Nu-h2
Nu-i
Nu-i1
Nu-i2
Nu-i3
Nu-i4
Nu-i5
Nu-l
Nu-l3
Nu-l4
Nu-l5
Nu-n
Nu-n1
Nu-o
Nu-p
Nu-p1
Nu-p2
Tokotan Pumice Formation (Nu-p3)
Nu-p5
Nu-q
Nu-r
KoP
NaP
WTfl-1
WTfl-2
KgSc
KuSc
TyP
HkP
Ds-Oh
YmP
Taisetsu Volcano Group
Asahidake Subgroup
Asahidake volcanic edifice
Early stage
E-2
Asahidake Summit Pyroclastic Rock
Banno-sawa Pyroclastic Rock and Lava
Asahidake Upper Pyroclastic Rock and Lava
Susoaidaira Pyroclastic Rock and Lava
Jigoku-daki Lava and Pyroclastic Rock
Asahidaira Lava and Pyroclastic Rock
E-1
Asahidake West Upper Lava and Pyroclastic Rock
Asahidake West Lower Lavas
Asahidake South Lavas
Ushiro-Asahidake volcanic edifice
Ushiro-Asahidake Lavas
Kumagatake volcanic edifice
Kumagatake No.3 Crater Pyroclastic Rock
Kumagatake Upper Lava and Pyroclastic Rock
Kumagatake Lower Pyroclastic Rock and Lava
Ohachidaira Caldera Eruption Deposit
Hx-type Pyroclastic Flow Deposit
Hb-type Pyroclastic Flow Deposit
Pon-Asahidake volcanic edifice
Oshima-Kojima volcano
Stage 3
Yamase-domari Lavas
Ai-domari Lavas
Benten-no-hana Lavas
Stage 2
Takino-ma Pyroclastic Rocks
Stage 1
Gome-saki Pyroclastic Rocks
Dai-Hiyakujima Intrusive Rock
Toya volcano
Toya Pyroclastic Flow Deposit
Tpfl I Unit
Tpfl II Unit
Tpfl III Unit
Tpfl IV Unit
Osarugawa Tephra
Usu volcano
Usu-b Tephra
Us-b1
Us-b2
Us-b3
Us-b4
Us-b5
Us-b6
Usu-a pumice bed (Us-a)
Us-Ia
Us-IIa
Tateiwa pyroclastic flow deposit (Us-IIIa)
Bunsei pyroclastic flow deposit (Us-IVa)
Us-Va
Donkoroyama scoria cone
Kousuyama lava dome
Ousuyama lava dome
Usu somma lava
Nakajima volcano
Nj-Sk Tephra
Nakajima-Osarugawa Tephra
Kuttara volcano
Kt-1 Tephra
Kt-2 Tephra
Kt-Tk Tephra
Kt-3 Tephra (Kuttara-3 Tephra)
Kt-Hy Tephra
Kt-4 Tephra (Kuttara-4 Tephra)
Kt-6 Tephra (Kuttara-6 Tephra)
Kt-7 Tephra
Kt-8 Tephra
Shikotsu volcano
Shikotsu Pyroclastic Flow Deposit
Shikotsu-1 Tephra
Shikotsu-3 pumice bed (Spfa-3)
Shikotsu-4 pumice bed (Spfa-4)
Shikotsu-5 Tephra
Shikotsu-6 Tephra
Shikotsu-7 pumice bed (Spfa-7, Shikotsu scoria bed)
Shikotsu-8 pumice bed (Spfa-8)
Shikotsu-9 pumice bed (Spfa-9)
Shikotsu-10 pumice bed (Spfa-10)
Shadai Tephra
Shadai Pyroclastic Flow Deposit
Eniwa volcano
Eniwa-a Tephra
Eniwa-b Tephra
Eniwa-c Tephra
Shiribetsu volcano
Kimobetsu Pyroclastic Flow Deposit
Shiribetsu Tephra
Yotei volcano
Y11 Tephra (Yotei-1 scoria bed, Yo.Ps-1)
Y16 Tephra (Yo.Ps-2)
Y25 Tephra (Yotei-3 scoria bed, Yo.Ps-3)
Mpfa1 Tephra
Ishikaritakaoka formation
Dateyama formation
Shishinai formation
Sapporo Fan Deposit
Ebetsu Sand Formation
Motonopporo Clay Formation
Nopporo Group
Upper
Konopporo Formation
Momijidai Formation
Hongo Formation
Lower
Shimonopporo Formation
Takeyama Formation
Otoebetsugawa Formation
Uranosawa Formation
Zaimokuzawa Formation
Hakken Formation
Yamaguchi Formation
Tarukawa Formation
Hayakita formation
Karurusu clay bed
Shiretokomisaki formation
Utoro formation
Shiretokoiozan volcano
Ubushinottakabu lava
Shiretokoiozanchubu lava
Shiretokoiozanjobu lava
Unabetsudake volcano
Unabetsudakeshinki lava
Unabetsudakekyuki lava I
Unabetsudakekyuki lava II
Gotenyama lava
Fumizuki formation
Tomikawa formation
Ishikura formation
Zenigamezawa pyroclastic flow deposit
Setana formation
Oyachi formation
Ksfl
Kpfa-2
Kpfa-3
Kpfa-4 (Nishiki-2 pumice bed)
Kpfa-5 (Nishiki-1 pumice bed)
Aso-4 tuff bed (Aso-4)
Kpfl-1
Kpfl-2
Kpfl-3
Ng-a
Tpfa
Sipfa-1
Sipfa-2
Shikotsu old sand dune deposit (Izumi sand dune deposit)
Shikotsu old sand dune deposit
Eniwa old sand dune deposit
I
II
III
IV
V
Kochien formation
Tokachi Group
Nakazato Formation
Shibusan Formation
Oribeyama Formation
Osarushinai Formation
Ikeda Group
Uppermost
Upper
Satsunai Formation
Osarushinaigawa Formation
Tokachigaoka Formation
Tokachigaoka Tuffaceous Sand Member
Chiyoda Formation
Iwamatsu Formation
Shikaribetsu-2 pumice bed (Uguisuiro pumice bed)
Shikaribetsu volcano
Petoutorusan lava
Tokachimitsumata caldera
Tokachimitsumata Pyroclastic Flow Deposit
Tokachimitsumata Pyroclastic Fall Deposit
Tokachimitsumata Formation
Gunkanyama Lava
Penkenikoro welded tuff bed
Tokachibuto Formation
Kamishikaribetsu Pyroclastic Flow Deposit
Kamiasahigaoka Pyroclastic Flow Deposit
Tokachigawa formation
Biraotori formation
Horokayanto formation
Biman Gravel Bed
Aso welded tuff bed (AWT, Kuro tuff)
Akan pyroclastic flow deposit
Akan upper pyroclastic flow deposit (AUP)
Akan lower pyroclastic flow deposit (ALP)
Kushiro Group
Toya Formation
Kushiro Formation
Toro Member
Takkobu Member
Shiroyama Formation
Otanoshike Formation
Miyajima Formation
Furenko formation
Bekanbeushigawa formation
Konsen formation
Furume pyroclastic flow deposit (Furume welded tuff bed)
Kusharo-shoro tuff bed (KSr)
Kusharo-horoiwa tuff bed (KHr)
Big pumice bed (Big Pm)
Ganpen pumice bed (Ganpen Pm)
Sanshoku tuff bed
Kiyosato-1 pumice bed
Kiyosato-2 pumice bed
Kuchoro formation
Bihoro formation
Horoiwa tuff bed
Toetoko tuff bed
Monbetsu-1 tuff bed
Monbetsu-2 tuff bed
Urausu formation
Higashichitose formation
Kakuta formation
Shiomi formation
Moseushi formation
Mukawa-3 pumice bed (Mpfa-3)
Azuma tuff bed
Tokachi Pyroclastic Flow Deposit
Kushuko formation
Yunputo shell bed
Keihoku formation
Wankonosawa pumice bed
Chikubetsu terrace deposit
Tomamae terrace deposit
Kamisarufutsu formation
Ponnitachinai formation
Asajino formation
Okhotsk loam bed
Fukinodai formation
Furen formation
Hatsuchashinai formation
Biei welded tuff bed
Sangoku Formation
Shiitokoro Lava
Tokorogawa Formation
Tonokari formation
Shirataki formation (Shirataki welded tuff bed)
Antaromagawa welded tuff bed
Aizankei welded tuff bed
Tokachidake volcano
Younger stage 1
Middle stage
Older stage
OKina lava
Orangeiro-1 tuff bed (Op-1)
Orangeiro-2 tuff bed (Op-2)
Orangeiro-3 tuff bed (Op-3)
Poanyoro pumice flow deposit
Poanyoro pumice bed
Kasabetsu formation
Noboribetsu pumice bed
Noboribetsu welded tuff bed
Noboribetsu formation
Ranpoge pumice bed
Nittaporo formation
Misato formation
Shimoabira formation
Shiomi formation
Maruyama formation
Shinkawa formation
Wattsu formation
Nishinosato formation
Hiroshima formation
Atsubetsu formation
Rishiri volcano
Final stage
Tanetomi Lava
Kutsugata Lava
Nozuka Lava
Senhoshi Lava
Nocchu Pyroclastics
Climactic stage
Ishiyama Lava Dome
Main part of stratovolcano
Chokan'yama stratovolcano
Initial stage
Lower part of stratovolcano
Lava dome group
Pon'moshirito Lava Dome
Peshi-misaki Lava Dome
Oshidomari-pon'yama Lava Dome
Fujino Lava Dome
Minamihama Lava
Oshidomari Lava
Tanetomi lava
Kutsugata lava
Giboshinuma lava
Nozuka lava
Ichinosawa scoria cone
Komagatake volcano
Stage II
P3
P4
P5
P6
P7
Ko-h
Stage I
Ko-i
Numajiri Debris Avalanche Deposit
P8
Matsuyazaki Debris Avalanche Deposit
Kengamine Lava
Sawaradake Agglutinate
Komagatake Debris Avalanche Deposit
Akan volcano
Ak1
Ak2
Ak3
Ak4
Ak5
Ak6
Ak6-a
Ak6-b
Ak6-c
Ak6-d
Ak7
Ak7-a
Ak7-b
Ak7-c
Ak7-d
Ak7-e
Ak8
Ak9
Ak9-a
Ak9-b
Ak9-c
Ak10
Ak11
Ak12
Ak12-a
Ak12-b
Ak12-c
Ak13
Ak13-a
Ak13-b
Ak14
Ak14-a
Ak14-b
Ak14-c
Ak14-d
Ak14-e
Ak14-f
Ak14-g
Ak15
Ak15-a
Ak15-b
Ak15-c
Ak15-d
Ak15-e
Ak15-f
Ak16
Ak17
HR-3
Sarabetsu Formation
Kaminagawa Formation
Kuchoro Pyroclastic Flow Deposit
LowK-2
LowK-1
Pleistocene-Holocene
Nishihama Bed
Shikotsu volcano
Fuppushi volcano
Maruyama volcanic products
Nipesotsu volcanic products
Holocene (0.01-0 Ma)
Rishiri volcano
Final stage
Numaura Pyroclastics
Kutcharo volcano
Post-Kutcharo caldera volcano
Atosanupuri volcano
Younger Atosanupuri Volcano
Atosanupuri I Lava Domes
Maruyama Lava Dome
Nupuriondo Lava Dome
274m-yama Lava Dome
Nifushioyakotsu Lava Dome
Tosamoshibe Lava Dome
Optateshuke Lava Dome
Atosanupuri II Lava Domes
Rishiri Lava Dome
Rishiri Pyroclastic Flow Deposit
Sawanchisappu Lava Dome
Makuwanchisappu Lava Dome
Atosanupuri Older Lava Dome
Atosanupuri Younger Lava Dome
Mashu volcano
Central cone building stage
Upper Mashu Tephra Formation
Ma-b
Ma-b5
Ma-c
Ma-d
Ma-e
Caldera forming stage
Upper Mashu Tephra Formation
Mashuko pyroclastic flow deposit (Ma-f)
Mashu-g pumice bed (Ma-g)
Mashu-h pumice bed (Ma-h)
Mashu-i pumice bed (Ma-i)
Ma-j
Ma-k
Ma-l
Taisetsu Volcano Group
Asahidake Subgroup
Asahidake volcanic edifice
Late stage
Jigokudani Volcaniclastic Rock 2
Jigokudani Volcaniclastic Rock 1
Shikotsu volcano
Tarumae volcano
Year1874 fall bed (Tarumae volcano)
Tarumae-a Tephra
Tarumae-b Tephra
Tarumae-c Tephra
Tarumae-c1 pumice bed (Ta-c1, Tarumae-c1 tuff bed)
Tarumae-c2 pumice bed (Ta-c2, Tarumae-c2 tuff bed)
Tarumae-d Tephra
Kiiro pumice bed (Us-c)
Baitoushan-Tomakomai Tephra
Showashinzan volcano
Lava dome
Atsuma formation
Shiretokoiozan volcano
Shiretokoiozan debris flow deposit
Namakoyama lava dome
Nanpo lavadome
Sasihruidake lava
Me-a
Komagatake volcano
Stage IV
1942
Ko-a
Ko-c1
Ko-c2
Ko-d
Kurumizaka Debris Avalanche Deposit
Stage III
Ko-f
P1
P2
Ko-g
Es-2
Motomura pyroclastic flow deposit
Tokachi-c1tuff bed (To-c1)
Tokachi-c2 tuff bed (To-c2)
Meakan-a1 tuff bed
Meakan-a2 tuff bed
Meakan-a3 tuff bed
Meakan-b scoria bed
Rawan pyroclastic flow deposit
Atosanupuri lava dome
Hotoku tuff bed
Shizen shell bed
Wakkaoi formation
Tateyama loam bed
Zenkoji lahar deposit
Ishikari Dune Sand
Momiiyama Dune Sand
Bannaguro Sand Bed
Maeda Sand Bed
Kuttara volcano
Noboribetsu volcano
Hiyoriyama lava dome
Oyunuma volcanic product
Jigokudani volcanic product
Kuttara pyroclastics bed
Kitayama lava
Niikappu mud volcano
Tokachidake volcano
Younger stage 2
Volcanic Fan 3 Deposit
1926AD Lahar Deposit
Unit A
Unit B
Unit C
Ground Crator Pyroclastic Flow Deposit 0
Shirogane Mudflow Deposit
Ground Crator Pyroclastic Flow Deposit 1
Ground Crator Pyroclastic Flow Deposit 2
Investigation in progress
Chashikotsunai Formation
Penke Formation
Koganeyu andesite
Hyakumatsuzawa quartz porphyry
Hyakumatsuzawa formation
Moiwayama volcano
Moiwayama lava
Moiwayama-I lava
Moiwayama-II lava
Moiwayama-III lava
Gunkanmisaki lava
Rusutsu pyroclastic flow deposit
Chisenupuri debris flow deposit
Hongo formation
Horoman peridotite
Oshinkoshin intrusion
Unabetsudake volcano
Unabetsudake873mpeak lava dome
735.3mpeak lava
Kounabetsudake dike
Kounabetsudake pyroclastic rocks
Kounabetsudake lava
Tachimachimisaki lava
Koryuji lava
Mohejigawa formation
Esan lava dome
Futoro formation
Tsukunai member
Shikaribetsu-1 pumice bed (Tangara pumice bed)
Kamishihoro formation
Kitaoribe formation
Kamihoroka welded tuff bed
Uesakayama formation
Higashimeto tuff bed
Kakkomi tuff bed
Osatsube formation
Meakan volcano
Meakanfuji lava
Ponmachineshiri lava
Nakamachineshiri lava
Nakamachineshiri somma lava
Kengamine lava
Sanchobu lava dome
Futatsudake lava
Meakandake lava
Furebetsukazan950mpeak lava
Rausudake volcano
Rausudaira lava
Rausudake lava dome
Rausudake lava
Abashiri tuff bed
Horonari trondhjemite
Takadomari serpentinites
Irumukeppu volcano
Otoeyama lava
800msan lava
Okirikawa lava
Irumukeppu lava
805msan lava
Okirikawakosenzawa lava
Raijo formation
Ochiai formation
Penke lava
Shirogane formation
Shirogane lava
Shirataki granite
Shirataki bodies
Esan volcano
Misaki lava
Choshimisaki formation
Otoebetsugawa formation
Takinoue welded tuff bed
Maruyama lava
Nakagawa formation
Furano formation
Geological structures
Hidaka main thrust
Tobetsu fault
Izumisato fault
Naganuma fault
Yakumo fault
Oribe fault
Satsunaigawa-Otofukegawa fault
Urahoro fault
Kotanuka fault
Sakaemori fault
Omagari fault
Nayoro fault
Chiebun fault
Rokugo fault
Abashiri tectonic line
Urahoro fault
Abashirikotoho faults
Bannosawa thrust
Urausu fault
Yamabe fault
Oribe fault
Shirataki tectonic line
Kamishiyubetsu tectonic line
Tokachichuo tectonic zone
Shunbetsu anticline
Sarubetsu anticline
Shintotsukawa anticline
Otanikaigan anticline
Sorachi anticline
Tobetsu syncline
Oshirarika syncline
Chikubetsu syncline
Hatonosu dome
Manji dome
Harutoritaro clastic dike