. "274.4"^^ . "BLYT"@en . "Stratified bedrock. Occurs onshore. Deposited during the Guadalupian Epoch - to - Lopingian Epoch (Permian Period) (274.4-251.9 Ma BP)."@en . . . "Ballytrea Formation"@en . . . "Upper Permian Marls [Obsolete: use BLYT]"@en . . "stable"@en . "Ballytrea Formation"@en . . "251.9"^^ .