. . . "Coal."@en . "Cliff Coal (Milford, South Wales)"@en . "Cliff Vein [Obsolete: use CLFC]"@en . . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage - to - Asturian Substage (Carboniferous Period) (318-307.5 Ma BP)."@en . "318.0"^^ . "307.5"^^ . . . "CLFC"@en . "stable"@en . . "Cliff Coal (Milford, South Wales)"@en .