"Ghrudaidh Formation [Duplicate: use GUD]"@en . "508.0"^^ . "stable"@en . . . "Dark to mid-grey dolostones containing burrow mottling, oolitic and bioclastic grainstones and rare stromatolites."@en . . "GUD"@en . "Dolomitic limestone and dolostone with subsidiary limestone and trace dolomitic siltstone and sandy dolostone. Stratified bedrock. Occurs onshore. Deposited during the Comley Series (Cambrian Period) (526-508 Ma BP)."@en . . "From 50 m to 60 m thick."@en . "Ghrudaidh Formation"@en . . . "Grudaidh Formation"@en . . . "Conformably overlain by pale grey and buff flaggy dolostones of the Eilean Dubh Formation. A zone of interbedded dark and pale grey dolostones occurs at the boundary. The actual contact with the Eilean Dubh Formation is taken at the appearance of laminations and/or chert layers."@en . "Ghrudaidh Group [Obsolete: use GUD]"@en . . . "Ghrudaidh Formation"@en . "526.0"^^ . . "Conformably overlies the Salterella Grit Member of the An T'Sron Formation. The boundary is gradational over about a metre."@en .