"stable"@en . . . . "432.9"^^ . "FOLF"@en . . "Foel Fadian Formation"@en . . . . "Foel Fadian Formation"@en . "Stratified bedrock. Occurs onshore. Deposited during the Telychian Age (Silurian Period) (438.6-432.9 Ma BP)."@en . "438.6"^^ .