"Barnsley Rock"@en . "stable"@en . "318.0"^^ . "314.75"^^ . "Barnsley Rock"@en . . "BNR"@en . . . . "Sandstone. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . "0 to c.36m"@en . . . . "Flaggy sandstone of variable thickness and composition."@en . .