. "Gur Coal (Coalbrookdale)"@en . "stable"@en . "318.0"^^ . . "GRCC"@en . . . . "Gur Coal (Coalbrookdale)"@en . "314.75"^^ . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . "Coal."@en . . . .