. . . . . "1000.0"^^ . "stable"@en . "Quartzite."@en . "Jura Quartzite Formation"@en . . "JUQU"@en . "Quartzite. Stratified bedrock. Occurs onshore. Deposited during the Neoproterozoic Era (Precambrian) (1000-541 Ma BP)."@en . . "Islay Quartzite"@en . "Jura Quartzite [Obsolete: use JUQU]"@en . "Jura Quartzite Formation"@en . . "541.0"^^ . . .