• 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

• Jigoku-daki Lava and Pyroclastic Rock
• Jigokudani Accessory Tephras
• Jigokudani Formation
• Jigokudani Lava
• Jigokudani Volcaniclastic Rock 1
• Jigokudani Volcaniclastic Rock 2
• Jiigatake Caldera
• Jiigatake-Shirasawatengu Caldera Complex
• Jiigatake Volcanics
• Jike Formation
• Jikkoku Formation
• Jimmuji Volcaniclastics and Mudstone Member
• Jinaijima volcano
• Jinakayama volcano
• Jinba Debris Avalanche Deposit
• Jingamine Formation
• Jingaoka Volcanic Rock Member
• Jinguji Andesite
• Jinooka volcano
• Jinzai Basalt
• Jinzai Formation
• Jinzu Group
• Jishabatake Formation
• Jito Formation
• Jitogata Alternation
• Jizodaira Intrusive Rocks
• Jizodaira Tephra
• Jizodake Dacite
• Jizodake Rhyolite
• Jizodo Formation
• Jizodo Mollusca Bed
• Jizotoge Formation

• 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
• Jodogahama Rhyolite
• Jodogahama Rhyolites
• Joetsu Belt
• Joetsu Group
• Joetsu Metamorphic Belt
• Joetsu-O18L Tephra
• Jo Formation
• Jogakura Dacite
• Jogakura Lava
• Jogashiro Formation
• Jogodani Formation
• Jo Group
• Jokoji Formation
• Jokoji Loam
• Jokurayama Lava
• Jomine Subunit, Lower
• Jomine Subunit, Upper
• Jonai Group
• Jonoirizawa caldera
• Jonoirizawa Formation
• Jorozawagawa Lava
• Joryu Tonalite
• Joshita Sandstone and Conglomerate Member
• Josho Lake Deposit
• Joso Clay
• Joso Formation
• Josoji Formation
• Jozankei Group
• Jozenji facies
• Jozenji Formation
• Jozenji Sand Member

• Jp

• Jsg
• Jsp

• Jujikyo Diorite
• Jukkoku Formation
• Jumaisan Formation
• Jumonji mass
• Junicho Formation
• Junidaira Formation
• Junigatake Lapilli Tuff Member
• 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