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