"Coal."@en . . "Glasgow Main Coal (Central Coalfield)"@en . . . . "314.75"^^ . "Glasgow Main Coal (Central Coalfield)"@en . "318.0"^^ . "GMA"@en . . . "stable"@en . . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . .