. . . "stable"@en . "318.0"^^ . "Better Bed Fireclay"@en . . . "Seat-earth mudstone. Stratified bedrock. Occurs onshore. Deposited during the Langsettian Substage (Carboniferous Period) (319-318 Ma BP)."@en . "319.0"^^ . "BBFC"@en . "Better Bed Fireclay"@en . "Seat-earth mudstone."@en . . . .