"stable"@en . "ARPR"@en . "541.0"^^ . . . "4000.0"^^ . . "Bedrock. Occurs onshore. Formed during the Archean Eon - to - Proterozoic Eon (Precambrian) (4000-541 Ma BP)."@en . "Archaean And Proterozoic Rocks (Undifferentiated)"@en . "Archaean And Proterozoic Rocks (Undifferentiated)"@en . .