• Baitoushan-Tomakomai Tephra
• Baitoushan-Tomakomai Tuff Bed
• Banda Basalt
• Bandai 1888 debris avalanche deposit
• Bandai 1888 Lahar Deposit
• Bandai volcano
• Bandodani Formation
• Bannaguro Sand Bed
• Banno-sawa Pyroclastic Rock and Lava
• Banshoyama Subunit
• Basal Gravel
• Basal Member, Hashikadani Formation
• Basal tonalite, Hidaka Plutonic Rocks

• Benten-no-hana Lavas
• Beppo Formation
• Besshi Eclogite unit
• Besshi unit

• Bihoku Group

• Black sand, Shonai sand dunes

• B Member

• Bodaijiyama Formation
• Bodaijiyama Volcanics
• Boroishi Formation

• Busetsu Granite
• Butaijima Basalt Member

• Byobuiwa Lavas
• Byobuiwa volcanic body