. "Draughton Limestone"@en . "DRL"@en . . . "Limestone. Stratified bedrock. Occurs onshore. Deposited during the Asbian Substage (Carboniferous Period) (337-330.9 Ma BP)."@en . "Draughton Limestone"@en . . "330.9"^^ . "Limestone."@en . "337.0"^^ . . "Cat Gill Limestone"@en . . . . "stable"@en .