"stable"@en . "541.0"^^ . . . "Sandstone with subsidiary limestone. Bedrock. Occurs onshore. Formed during the Cambrian Period - to - Ordovician Period (541-443.1 Ma BP)."@en . . "443.1"^^ . "Cambrian And Ordovician Rocks (Undifferentiated)"@en . "Cambrian And Ordovician Rocks (Undifferentiated)"@en . . "CAOR"@en .