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