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