"stable"@en . "Chalmerston Coal (Dalmellington, South Ayrshire)"@en . . "318.0"^^ . . . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . "314.75"^^ . . "Coal."@en . . "CH"@en . . . . "Chalmerston Coal (Dalmellington, South Ayrshire)"@en .