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