. . . "Bottom Coal (South Staffordshire)"@en . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Langsettian Substage (Carboniferous Period) (319-318 Ma BP)."@en . . . "Coal."@en . "stable"@en . "318.0"^^ . . "BOTC"@en . "Bottom Coal (South Staffordshire)"@en . . . "319.0"^^ .