. "346.7"^^ . "330.3"^^ . "stable"@en . . . "Stratified bedrock. Occurs onshore. Deposited during the Visean Age (Carboniferous Period) (346.7-330.3 Ma BP)."@en . . "Dunnet Shell Bed"@en . "Dunnet Shell Bed"@en . . . . "DTSB"@en . .