"Ettrickbridge Formation"@en . . . "stable"@en . . . . "449.75"^^ . "Within Upper Hartfell Shale Formation."@en . . . "Ettrickbridge Formation"@en . "Sandstone turbidite unit."@en . "Sandstone and wacke with subsidiary mudstone and siltstone. Stratified bedrock. Occurs onshore. Deposited during the Ashgill Series (Ordovician Period) (449.75-443.1 Ma BP)."@en . . "Within Upper Hartfell Shale Formation."@en . "443.1"^^ . "EKB"@en . "c.55m"@en .