. . . . . "Seven-Feet Coal (South Wales)"@en . "319.0"^^ . "7FCO"@en . "stable"@en . "Seven-Feet Coal (South Wales)"@en . . "318.0"^^ . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Langsettian Substage (Carboniferous Period) (319-318 Ma BP)."@en . . . "Coal."@en .