"Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . "stable"@en . "318.0"^^ . "CHMC"@en . . . . "Coal."@en . "Cinderhill Main Coal (Nottingham And Derby)"@en . "314.75"^^ . . . . . "Cinderhill Main Coal (Nottingham And Derby)"@en . .