. . . . "Brooch Coal (South Staffordshire) [Duplicate: use BROO]"@en . . "Brooch Coal (South Staffordshire)"@en . "BRCH"@en . "[Duplicate: use BROO]"@en . "stable"@en . "318.0"^^ . . . . "Brooch Coal (South Staffordshire) [Duplicate: use BROO]"@en . "314.75"^^ . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en .