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