. . "Sandstone."@en . . "310.0"^^ . "Sandstone. Stratified bedrock. Occurs onshore. Deposited during the Asturian Substage - to - Stephanian Stage (Carboniferous Period) (310-300.5 Ma BP)."@en . "300.5"^^ . "stable"@en . . "Arley Conglomerate [Obsolete: use ARSA]"@en . . . . "Arley Sandstone [Obsolete: use ARSA]"@en . . "Arley And Exhall Sandstones"@en . . "ARSA"@en . "Arley And Exhall Sandstones"@en .