• G1 Bed, Niigata pref.
• G1, Marumori Granitic Complex
• G2 Bed, Kanbara Group
• G2, Marumori Granitic Complex
• G3 Bed, Kanbara Group
• G3, Marumori Granitic Complex
• G3', Marumori Granitic Complex
• G3, Suberidani Group
• G4 Bed, Kanbara Group
• G4, Suberidani Group
• G5 Bed, Kanbara Group

• Gabasawa Tuff Member
• Gabbroic rocks, Goyosan Pluton
• Gabbros, Hidaka Plutonic Rocks
• Gabbro Unit
• Gairinzankoki Tuff Breccia
• Gakkogawa Lava
• Gamaharayama Lava
• Gamaharazawa Formation
• Gamano Granodiorite
• Gamanosawa Formation
• Gamata Crystalline Schist
• Gamodo Gravels Member
• Gamodo Tephra
• Gamo Formation, Kobiwako Group
• Gamo Formation, Kanmon Group
• Gamo mud volcano
• Gamo Pyroclastic Flow Deposit
• Gandoya Tuff Breccia
• Gankaizan Formation
• Gannyo Clay
• Ganya Basalt
• Ganzo Formation
• Garameki Formation
• Garan Mass
• Garan Pyroclastic Deposit
• Garnet-biotite-muscovite Granite
• Gassanchuo volcano
• Gassanmori Lava
• Gassan volcano
• Gawatani mass
• Gazo mass

• Geba Formation
• Gempachimori Formation
• Genbi Formation
• Genbudo Lava
• Genjidake Welded Tuff
• Genjigawa Group
• Gennoike Clastic Rocks
• Gennoike Formation
• Genpachimori Formation
• Gentamori Lava

• Gfl-0
• Gfl-1
• Gfl-2

• Giboshisen Lava
• Giboshisen volcano
• Ginamboku Member
• Ginnanboku Member
• Giya Tuff

• Gjd10
• Gjd20
• Gjd34
• Gjd35
• Gjd39
• Gjd40
• Gjd60
• Gjd64
• Gjd69
• Gjd70

• Glacial deposits, Mount Shiroumadake

• Go1
• Go2
• Gobakubo Formation
• Gobanshoyama Formation
• Gobuta Tuff Member
• Gochidani Member
• Godaigo Formation
• Godo Conglomerate Member
• Godo Formation, Gunma pref.
• Godo Formation, Saitama pref.
• Godo Sandstone and Conglomerate Member
• Gogoshima Group
• Gohogi Lake Deposit
• Gohyakuyama Andesite Member
• Goi Mudstone Member
• Goishihama volcano
• Gojo Formation
• Gojo Tephra
• Gokanosho Metamorphic Rocks
• Goka Rhyolite
• Gokashoura Formation
• Gokenjaya Tephra
• Goko Scoria Flow Deposit
• Gomado Tuff Breccia Member
• Gomaizawa Formation
• Gombo Formation
• Gome-saki Pyroclastic Rocks
• Gomijima Formation
• Gonda Formation
• Gonda Sandstone Conglomerate Member
• Goneo Sandstone Body
• Gongendake Pyroclastic Rocks
• Gongen Formation
• Gongenike volcano
• Gongen mass
• gongenyama Formation, Dewa hills
• Gongenyama Formation, Sagamiko Group
• Gongenyama Unit
• Gongenzaki Formation
• Gongenzawa Member
• Gonoharu Formation
• Gonoike Scoria
• GoP1
• GoP2
• Gora Lapilli Tuff Member
• Gora Tuffaceous Sand-mud Member
• Gorinbara Basalt Lava
• Goroku Formation
• Goryo Formation
• Goryu Rhyolite
• Gos
• Gosaisho Metamorphic Rocks
• Goshakubo Formation
• Goshikidake Pyroclastic Rocks
• Goshikinuma unit
• Goshotai volcano
• Goshoura Group
• Gosj-1
• Gosj-2
• Gosj-3
• Gosj-t
• Gotanda Formation
• Gotenba Mudflow Deposit
• Gotentoge Formation
• Gotentoge 1 Terrace Deposit
• Gotentoge 2 Terrace Deposit
• Gotentoge 3 Terrace Deposit
• Gotentoge Terrace Deposit
• Gotenyama Formation
• Gotomiki Lava
• Gotsu Volcanic Rocks
• Goyasu Formation
• Goyosan Granodiorite
• Goyosan Pluton
• Gozaisho Metamorphic Rocks
• Gozaisho-Takanuki Metamorphic Rocks
• Gozenyama Formation
• Gozenyama Unit
• Gozu Granite
• Gozu Granite

• GP, Aomori pref.
• GP, Chiba pref.

• Gr
• Gravel Bed I, Mount Tateyama
• Gravel Bed II, Mount Tateyama
• Gravel Bed III, Mount Tateyama
• Gravel Bed IV, Mount Tateyama
• Gray
• Ground Crator Pyroclastic Flow Deposit 0
• Ground Crator Pyroclastic Flow Deposit 1
• Ground Crator Pyroclastic Flow Deposit 2

• G scoria cone, Miyakejima volcano
• G Shale Member

• Gtp
• GtpA
• GtpB
• GtpC

• Gujo Formation
• Gumihara Formation
• Gumihara Sand
• Guminoki Tephra
• Gumizaki Formation
• Gunchu Formation
• Gunkanyama Lava

• Gyodosan Complex
• Gyojagaeridake Formation
• Gyojanoiwaya volcano
• Gyojayama Granodiorite