"Double Coal (Warwickshire)"@en . . . "319.0"^^ . . "DOUB"@en . "Double Coal (Warwickshire)"@en . . "stable"@en . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Langsettian Substage (Carboniferous Period) (319-318 Ma BP)."@en . . . "Coal."@en . . . "318.0"^^ .