. . "Holly Lane Coal (North Staffordshire)"@en . "stable"@en . "318.0"^^ . . . "314.75"^^ . . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . "Holly Lane Coal (North Staffordshire)"@en . "Coal."@en . . . "HLLC"@en . .