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