. "Coal."@en . "318.0"^^ . . "FYRD"@en . . "Five Yard Coal (North Wales)"@en . . "Five Yard Coal (North Wales)"@en . "stable"@en . . "314.75"^^ . . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . .