"310.0"^^ . . . . . . "Coal."@en . . . "Highgate Coal (South Yorkshire)"@en . "HGTC"@en . "Highgate Coal (South Yorkshire)"@en . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Bolsovian Substage (Carboniferous Period) (314.75-310 Ma BP)."@en . "314.75"^^ . "stable"@en . .