. "Not exposed, faulted out."@en . "Greenan Sandstone Formation"@en . . "At least 550m, probably to more than 1000m"@en . "327.0"^^ . "Greenan Formation [Obsolete: use GNNS]"@en . "GNNS"@en . "Greenan Sandstone Formation"@en . "Unconformable on Dalradian Supergroup metamorphic rocks"@en . . "stable"@en . . . "Sandstone, purple-grey weathering distinctive orange-purple, medium- to coarse-grained, parallel and cross-laminations, thin layers of purple-red and green mudstone; basal breccia of metamorphic clasts."@en . . "Sandstone with subsidiary breccia and mudstone. Stratified bedrock. Occurs onshore. Deposited during the Brigantian Substage - to - Pendleian Substage (Carboniferous Period) (330.9-327 Ma BP)."@en . "330.9"^^ .