. "Beinn An Dubhaich Limestone"@en . "477.1"^^ . . . . "Bedrock. Occurs onshore. Formed during the Arenig Series (Ordovician Period) (477.1-468 Ma BP)."@en . "Beinn An Dubhaich Limestone"@en . "468.0"^^ . . "BDL"@en . "stable"@en . .