• Oarasawa Formation
  • Obama Formation
  • Obara Tonalite
  • Obata Formation
  • Obatake Granodiorite
  • Obiki Unit
  • Oboke unit
  • Obusuma Group
  • Ochiai Conglomerate Formation
  • Ochiai Formation
  • Odakegawa Lavas
  • Odokorogawa Formation
  • Ofuji Lava
  • Ofuna Formation
  • Ofuna Mudstone Formation
  • Ofunato Subbelt
  • Oganomachi Formation
  • Oganomachi Group
  • Ogawa Formation
  • Ogigakura Tuff
  • Ogikubo Sandy Mudstone Member
  • Ogi Quartz Diorite
  • Ogo Pumice Flow Deposit
  • Ohachidaira Caldera Eruption Deposit
  • Ohachimori Amphibolites
  • Ohashi Formation
  • Ohatayama Lavas
  • Ohatayama Pyroclastic Rocks
  • Ohirayama Unit
  • Ohno Formation
  • Ohno Volcanic Rocks
  • Ohyamashimo Formation
  • Ohzone Formation
  • Oi Formation
  • Oishi Formation (ŠâŽè)
  • Oishi Formation (Œä‰×–gƒ†ƒjƒbƒg)
  • Oishigawa-futamata Lavas
  • Oishigawa Lavas
  • Oishigawa Pyroclastic Flow
  • Oishigawa Volcanic Rocks
  • Oishi Lava
  • Ojo Formation
  • Okamotsugawa Complex
  • Okamura Formation
  • Okanaro Group
  • Okawaratoge Pyroclastics
  • Okinazawa Basalt Member
  • Okuda Formation
  • Okuda Tuff Bed
  • Oku Formation
  • Okukurobe Granite
  • Okumatashiro Granite
  • Okushibetsu Plutonic Complex
  • Okuwa Debris Avalanche Deposit
  • Okuwahara Sandstone Member
  • Okuyama Formation
  • Okuzure Formation
  • Old dune, Shonai sand dunes
  • Older Atosanupuri Volcano
  • Older Inbi stage intrusive rocks
  • Older Kitadake Volcano
  • Older Minamidake Volcano
  • Older Ryoke Granitoids
  • Older stage Hokusatsu Volcanic Rocks
  • Older stage Nansatsu Volcanic Rocks
  • Older Stratovolcano (Akagi Volcano)
  • Oldest stage Nansatsu Volcanic Rocks
  • Omae Unit
  • Omagari carbonate islet
  • Omagari Formation
  • Omama Complex
  • Omi Complex
  • Omi Limestone
  • Omi Metamorphic rocks
  • Omine Acidic Tuff Bed
  • Omine Pyroclastic Flow Deposit
  • Omine Welded Tuff Bed
  • Omma Formation
  • Omma Sandstone Formation
  • Omori Formation
  • Omuro Lava
  • Onagata Subunit
  • Onbetsu Group
  • Onigatsuji Mudstone and Sandstone Member
  • Onishi Conglomerate Member
  • Onma Formation
  • Onma Sandstone Formation
  • Onnagawa Formation
  • Onzawa Facies
  • Oppata Granite
  • Oritate Conglomerate
  • Oritate-toge Conglomerate
  • Orito Formation
  • Oro Formation
  • Orojidani Formation
  • Osaka Dacite
  • Osaka Group
  • Osakamoto Formation
  • Osakatoge Complex
  • Osakatoge Formation
  • Osakihana Dacite
  • Osawa Formation (Inai Group)
  • Osawa Formation (Tanzawa Group)
  • Osawaguchi Tuff Member
  • Osawa Tuff Formation
  • Oshidomari Lava
  • Oshidomari-pon'yama Lava Dome
  • Oshima Belt
  • Oshima-Kojima volcano
  • Oshimayama Subunit
  • Oshimojo Formation
  • Oshirasawa Granite
  • Osoushinai Formation
  • Osumi Granodiorite
  • Otakidani Formation
  • Otani Lavas
  • Otanoshike Formation
  • Otogawa Formation
  • Otoge Volcanic Complex
  • Otonashigawa Belt
  • Otonashigawa Group
  • Otori Formation
  • Otori Unit
  • Otsukamiya Granite
  • Oyabe Formation
  • Oyabe Mudstone Formation
  • Oyakkotsu Lava Dome
  • Oyamada Formation
  • Oyama Formation, Hayama Group
  • Oyama Formation, Tokai Group
  • Oyama Subgroup
  • Oyama Tuffaceous Sandstone Formation
  • Oyashirazu Formation
  • Oyashirazu Volcanic Rocks
  • Ozenji Formation
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