"318.0"^^ . "Accrington Mudstone"@en . . . . . "ACM"@en . "319.0"^^ . . . "Accrington Mudstone"@en . "Mudstone."@en . "Mudstone. Bedrock. Occurs onshore. Formed during the Langsettian Substage (Carboniferous Period) (319-318 Ma BP)."@en . "stable"@en . . .