"422.7"^^ . . "Llan-Wen Hill Beds [Obsolete: use CEF]"@en . . . "Mudstone, siltstone and sandstone."@en . "stable"@en . "CEF"@en . "425.0"^^ . "Cefn Einion Formation"@en . . . . . . . . "Dalmanella Lunata Beds [Obsolete: use CEF]"@en . . "Mudstone, sandstone and siltstone. Stratified bedrock. Occurs onshore. Deposited during the Ludfordian Age (Silurian Period) (425-422.7 Ma BP)."@en . "Wern Quarry Beds [Obsolete: use CEF]"@en . . "Cefn Einion Formation"@en .