"stable"@en . "c. 4000-5000 m (estimate); thinning to the west."@en . "Siliceous to micaceous psammite with subsidiary pelite beds. In lower part: thick beds (0.3 - 2 m) with coarsening upwards cycles with cm thick pelitic beds. In higher part: coarsening upwards units of rhythmically interbedded psammitic (siliceous and locally quarzitic) and pelitic beds, with water escape structures and slump folds."@en . . "Micaceous psammite and psammite with subsidiary pelite and semipelite. Stratified bedrock. Occurs onshore. Deposited during the Tonian Period (Precambrian) (1000-720 Ma BP)."@en . "Lower Quartzite [Obsolete: use GLPS]"@en . "Glascarnoch Psammite Formation"@en . "Conformably upon the Altnaharra Psammite Formation (ALPS) - commonly with gradational boundary with the Glen Achall Psammite and Semipelite Member."@en . . "Conformably overlain by the Vaich Pelite Formation (VAPE). Boundary with Vaich Pelite Formation is normally sharp incoming of thick-bedded semipelite beds."@en . "720.0"^^ . . . . "1000.0"^^ . . . "Lower Psammite [Obsolete: use GLPS]"@en . . . "GLPS"@en . . . "Glascarnoch Psammite Formation"@en .