"Stratified bedrock. Occurs onshore. Deposited during the Asbian Substage (Carboniferous Period) (337-330.9 Ma BP)."@en . . "330.9"^^ . . . . "Gwaenysgor Limestone Formation"@en . . . "Gwaenysgor Limestone Formation"@en . "337.0"^^ . . . "stable"@en . "GWAE"@en .