• J1
• J2
• J3
• J4
• J5
• J6
• J7
• J8
• J9
• J10
• J11
• J12

• JA
• Jagatake Lava
• Jaishi volcano
• Jaiwa Tuff
• J Alternation of Sandstone and Mudstone
• Janokawauchi Formation
• JA-O18L

• JH

• Jifuku Member
• Jigoku-daki Lava and Pyroclastic Rock
• Jigokudani Accessory Tephra 1
• Jigokudani Accessory Tephra 2
• Jigokudani Accessory Tephra 3
• Jigokudani Accessory Tephra 4
• Jigokudani Accessory Tephras
• Jigokudani Dike
• Jigokudani Formation
• Jigokudani Lava
• Jigokudani Volcaniclastic Rock 1
• Jigokudani Volcaniclastic Rock 2
• Jigokunuma Lava
• Jiidakejobu Agglutinate
• Jiidakekabu Agglutinate
• Jiidake Lava
• Jiigatake Andesite
• Jiigatake Caldera
• Jiigatake-Shirasawatengu Caldera Complex
• Jiigatake Volcanics
• Jike Formation
• Jikkoku Formation
• Jimbu Member
• Jimmuji Volcaniclastics and Mudstone Member
• Jinaijima volcano
• Jinaka Lava
• Jinakayama volcano
• Jinba Debris Avalanche Deposit
• Jingamine Formation
• Jingaoka Volcanic Rock Member
• Jinguji Andesite
• Jinooka volcano
• Jinryo Sands Member
• Jinzai Basalt
• Jinzai Formation
• Jinzugawa Mass
• Jinzu Group
• Jishabatake Formation
• Jisse Formation
• Jito Formation
• Jitogata Alternation
• Jizodaira Intrusive Rocks
• Jizodaira Tephra
• Jizodake Dacite
• Jizodake Rhyolite
• Jizodo Formation
• Jizodo Mollusca Bed
• Jizomine Gravel Bed
• Jizotoge Andesite
• Jizotoge Body
• Jizotoge Formation
• Jizotoge Volcanic Rocks

• Jjj

• Job
• Joban Formation
• Jododaira JP1 Unit
• Jododaira JP2 Unit
• Jododaira JP3 Unit
• Jododaira JP4 Unit
• Jododaira JP5 Unit
• Jododaira JP6 Unit
• Jododaira JP7 Unit
• Jododaira volcano
• Jododani Complex
• Jododani Formation
• Jodogahama Rhyolite
• Jodogahama Rhyolites
• Joetsu Belt
• Joetsu Group
• Joetsu Metamorphic Belt
• Joetsu-O18L Tephra
• Jo Formation
• Jogahirayama Dacite Member
• Jogakura Dacite
• Jogakura Lava
• Jogashiro Formation
• Jogodani Formation
• Jogoyama Lava
• Jogoyama Lava Dome
• Jogoyama volcano
• Jo Group
• Johnbeach Volcanic Rocks
• Jokoji Formation
• Jokoji Loam
• Jokoji Mudstone Member
• Jokoku I Tephra
• Jokoku II Tephra
• Jokurayama Lava
• Jomine Subunit, Lower
• Jomine Subunit, Upper
• Jonai Group
• Jonan Complex
• Jonoirizawa caldera
• Jonoirizawa Formation
• Jono Sandstone and Conglomerate Member
• Jorozawagawa Lava
• Joryu Tonalite
• Joshita Member
• Joshita Sandstone and Conglomerate Member
• Josho Lake Deposit
• Joso Clay
• Joso Formation
• Josoji Formation
• Joyama Mudstone Member
• Joyo Member I
• Joyo Member II
• Jozankei Group
• Jozenbosan Member
• Jozenji facies
• Jozenji Formation
• Jozenji Sand Member

• Jp

• Jsg
• Jsp

• Jujikyo Diorite
• Jukkokudake volcano
• Jukkoku Formation
• Jukkoku Volcanic Rocks
• Jukkoku volcano
• Jumaisan Formation
• Jumonji mass
• Junicho Formation
• Junidaira Formation
• Junigatake Formation
• Junigatake Lapilli Tuff Member
• Junikanno Terrace Deposits
• Juniko Tuff Member
• Junitaki Acid Volcanic Rock
• Junitoge Green Tuff Member
• Junreitoge Conglomerate and Sandstone Member
• Jusanhama Group
• Jusanmairu Sandstone Member

• Jwg
• Jwg-1
• Jwg-2
• Jwg-3
• Jwg-4

• Jyagatake Lavas
• Jyodogahama Acidic Volcanic Rocks