. . "Bottom First Waterloo Coal (Derby)"@en . "stable"@en . "318.0"^^ . . . "27 Yard Coal (West Yorkshire)"@en . . "314.75"^^ . "Coal."@en . "B1WC"@en . . "Bottom First Waterloo Coal (Derby)"@en . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . . . .