. . . . "stable"@en . "458.2"^^ . . . "Ceiswyn Formation And Nod Glas Formation (Undifferentiated)"@en . . "Mudstone, siltstone and silty mudstone with subsidiary sandstone and tuff."@en . . "Mudstone, siltstone and silty mudstone with subsidiary sandstone and tuff. Bedrock. Occurs onshore. Formed during the Caradoc Series (Ordovician Period) (458.2-449.75 Ma BP)."@en . "449.75"^^ . "CWNG"@en . "Ceiswyn Formation And Nod Glas Formation (Undifferentiated)"@en .