"Coal. Stratified bedrock. Occurs onshore. Deposited during the Namurian Stage - to - Langsettian Substage (Carboniferous Period) (330.3-318 Ma BP)."@en . . "BOTH"@en . "Bogside Thick Coal"@en . . . . "stable"@en . "330.3"^^ . . "Coal."@en . "Bogside Thick Coal"@en . "318.0"^^ . .