"Pelite, quartzite and semipelite and trace graphitic pelite and psammite. Stratified bedrock. Occurs onshore. Deposited during the Neoproterozoic Era (Precambrian) (1000-541 Ma BP)."@en . . "541.0"^^ . . "Beinn A'Ghlo Transition Formation"@en . . . . "1000.0"^^ . "BGTR"@en . . "Beinn A'Ghlo Transition Formation"@en . . "stable"@en . "Pelite, quartzite and semipelite and trace graphitic pelite and psammite."@en . .