"Archerbeck Ochre Bed"@en . "Namurian."@en . . "AOB"@en . "330.3"^^ . "stable"@en . . . . "Archerbeck Ochre Bed"@en . . . . "Stratified bedrock. Occurs onshore. Deposited during the Namurian Stage (Carboniferous Period) (330.3-319 Ma BP)."@en . "319.0"^^ . .