. "541.0"^^ . . . "Grampian Group And Appin Group (Undifferentiated)"@en . "Bedrock. Occurs onshore. Formed during the Neoproterozoic Era (Precambrian) (1000-541 Ma BP)."@en . . . "1000.0"^^ . . . "stable"@en . "Grampian Group And Appin Group (Undifferentiated)"@en . "GRAPP"@en . .