"468.0"^^ . . "Dolostone and limestone and trace siliceous limestone. Stratified bedrock. Occurs onshore. Deposited during the Arenig Series (Ordovician Period) (477.1-468 Ma BP)."@en . "c.20m (estimated)."@en . "Dounans Limestone [Obsolete: use DSLM]"@en . "Dounans Limestone Formation"@en . "477.1"^^ . "Dounans Limestone Formation"@en . . "Limestone, massive, grey, fractured and veined; dolomitised and silicified over much of outcrop. Locally fossiliferous with a trilobite - brachiopod - gastropod faunal assemblage."@en . . . . "Not seen; unit has faulted and/or unconformable relationship with overlying Old Red Sandstone conglomerates and sandstones."@en . "Limestone is unconformable on largely carbonated and silicafied Lime Hill Serpentinite."@en . "DSLM"@en . . . "stable"@en . . .