. . "Habberley Shale Formation"@en . . "HBY"@en . "Green-grey shaly mudstones, siltstones and fine-grained sandstones."@en . "Shineton Shales [Obsolete: use HBY, SHSH]"@en . "Habberley Shale Formation"@en . . "477.1"^^ . . "Defined by facies change to Stiperstones Quartzite Formation. May be non-sequence at top."@en . . . "Not defined."@en . "c.800m"@en . "486.5"^^ . . "Mudstone, sandstone and siltstone. Stratified bedrock. Occurs onshore. Deposited during the Tremadoc Series (Ordovician Period) (486.5-477.1 Ma BP)."@en . "stable"@en .