"Feldspathic quartzite with subsidiary semipelite. Stratified bedrock. Occurs onshore. Deposited during the Neoproterozoic Era (Precambrian) (1000-541 Ma BP)."@en . . "541.0"^^ . . . "1000.0"^^ . "Feldspathic quartzite with subsidiary semipelite."@en . . . . "BIQU"@en . . "stable"@en . "Beinn Iaruinn Quartzite Formation"@en . . "Beinn Iaruinn Quartzite Formation"@en .