. . "Glen Effock Schists [Obsolete: use GES]"@en . "Gradational transition with incoming of muscovite-staurolite-schist and increase in proportion of gritty psammite and decrease in proportion of greenish feldpathic semipelite at base of overlying Glen Lethnot Grit Formation."@en . . . "Apparently 2500m thick in Greenburn - Colmeallie area (NO5578 to NO5977), but this figure is probably inflated by tectonic thickening."@en . . . "Semipelite with subsidiary pelite, psammite and quartzite and trace calcsilicate-rock and gritty psammite. Stratified bedrock. Occurs onshore. Deposited during the Neoproterozoic Era (Precambrian) (1000-541 Ma BP)."@en . . "Glen Effock Schist Formation"@en . . "1000.0"^^ . "Glen Effock Schist Formation"@en . . "stable"@en . . "Dominant semipelite, but with considerable psammite and pelite. Psammites micaceous but fairly massive, rarely gritty. Greenish feldspathic semipelite with high magnetic susceptibility and associated micaceous psammites locally abundant near the base of the Formation. Beds of white quartzite with specks of green mica occur, particularly near the top of the Formation. Calc-silicate rocks are extremely rare."@en . "Glen Effock (Pelite) Group [Obsolete: use GES]"@en . "First incoming of dark, greenish, biotitic and feldspathic semipelite with layers showing high magnetic susceptibility at top of Tarfside Psammite Formation."@en . "541.0"^^ . "GES"@en .