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