"Arnage Pluton"@en . . "443.1"^^ . . . . . . "Igneous intrusive bedrock. Occurs onshore. Emplaced during the Ordovician Period (486.9-443.1 Ma BP)."@en . . "486.9"^^ . "stable"@en . . "ARNA"@en . "Arnage Pluton"@en .