"Top sharp with overlying (inverted sequence) Robinson Member."@en . "GGM"@en . . "Breccia. Stratified bedrock. Occurs onshore. Deposited during the Tremadoc Series (Ordovician Period) (486.5-477.1 Ma BP)."@en . . . "stable"@en . "Goat Gills Member"@en . . . "486.5"^^ . . "477.1"^^ . "Goat Gills Member"@en . "Approx. 100 metres."@en . "Breccia, mainly of siltstone in a siltstone matrix."@en . . . "Base not seen."@en .