. "stable"@en . . "Stratified bedrock. Occurs onshore. Deposited during the Bolsovian Substage (Carboniferous Period) (314.75-310 Ma BP)."@en . "314.75"^^ . "310.0"^^ . . "BRAC"@en . "Bradford Coal Formation"@en . "Bradford Coal Formation"@en . . . . . .