"318.0"^^ . . "HMC"@en . . "stable"@en . . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . "Hurlford Main Coal (North Ayrshire)"@en . . "Coal."@en . "314.75"^^ . . "Hurlford Main Coal (North Ayrshire)"@en . . . .