. . . . "ALPS"@en . "1000.0"^^ . "stable"@en . . . "Altnaharra Psammite Formation"@en . "3 to 5 km. Accurate thickness is difficult to estimate due to subsequent deformation, see discussion in Krabbendam et al. (2014)."@en . "Unconformable upon Lewisian Gneiss inlier (L); unconformity highly sheared; locally conformable (?) on Meadie Schist Formation. In many places, base is cut and deformed by the Moine Thrust."@en . . . "The upper part of the Altnharra Formation is the Glen Achall Psammite and Semipelite Member (GACH). The upper boundary of this boundary is marked by a return to psammite of the Glascarnoch Psammite Formation. In western parts, the Altnaharra Formation is directly overlain by the Vaich Pelite Formation (Bonsor et al. 2010). In the north, the upper boundary is commonly marked by thrusts."@en . "A'Mhoine Psammite Formation [Obsolete: use ALPS]"@en . "720.0"^^ . "Psammite with subsidiary pebbly psammite and semipelite. Stratified bedrock. Occurs onshore. Deposited during the Tonian Period (Precambrian) (1000-720 Ma BP)."@en . "Altnaharra Psammite Formation"@en . . "Siliceous to feldspathic psammite with micaceous psammite, grey to buff; locally with micaceous layers. Gritty psammite occurs in the lower part; higher up in the unit, thin semipelitic beds become more common. Generally, strongly deformed and flaggy ('bed' thickness 5 - 30 cm). In low strain zones, the psammite shows thick beds (0.5 - 5 m): sedimentary structures include channels with pebble lags, planar and trough cross-bedding, slump-like folds, dewatering pipes and oversteepened cross-beds (Krabbendam et al., 2008). Palaeo-currents are to east or NE."@en . . .