"Granton Sandstones"@en . "Variable, but averaging c.18m"@en . . . . "Massive, thick-bedded sandstones, alternating with more thinly bedded layers, commonly with carbonaceous and shaly partings."@en . . . "GNST"@en . "stable"@en . "Craigleith Sandstone"@en . "Sandstone. Stratified bedrock. Occurs onshore. Deposited during the Visean Age (Carboniferous Period) (346.7-330.3 Ma BP)."@en . . "346.7"^^ . "330.3"^^ . . . . "Granton Sandstones"@en .