"477.1"^^ . "GHB"@en . "Garth Hill Beds"@en . "Garth Hill Beds"@en . . "486.5"^^ . . . "Stratified bedrock. Occurs onshore. Deposited during the Tremadoc Series (Ordovician Period) (486.5-477.1 Ma BP)."@en . "stable"@en . . . . .