• W1 Unit
• W2 Unit
• W2a Unit
• W2b Unit
• W3 Unit
• W4 Unit
• W4a Unit
• W4b Unit
• W5 Unit
• W6a Unit
• W6b Unit
• W6c Unit
• W6d Unit
• W6e Unit
• W6 Unit
• W7a Unit
• W7b Unit
• W7 Unit
• W8a Unit
• W8b Unit
• W8 Unit
• W9 Unit
• W10 Unit
• W11 Unit
• W12 Unit
• W13 Unit
• W14 Unit
• W15 Unit

• Wachi Formation
• Wachino Formation

• Wadatoge volcanics

• Wagakunisan Metamorphic Rocks

• Wakahata Formation
• Wakare Roam Formation
• Wakare Tuff Bed
• Wakino Subgroup
• Wakkanai Formation
• Wakubara Pumice Flow Deposit
• Wakugawa Formation
• Wakurayama Andesite
• Wakurayama Dacite

• Wariyama Formation
• Wariyama Granite
• Wariyama Metamorphic Rocks

• Wasabidani Complex
• Wasabu Alternation Member
• Wasabu Alternation of Sandstone and Mudstone
• Washigamine volcanics

• Western part (Hida Belt)
• West-Iwate volcano