"Magnesian Limestone (Yorkshire), Upper [Obsolete: use BTH]"@en . "Upward transition from mudstones of underlying Edlington Formation."@en . "Magnesian Limestone (of Yorkshire), Upper [Obsolete: use BTH]"@en . . "Brotherton (Magnesian Limestone) Formation [Obsolete: use BTH]"@en . "Upward passage into Billingham Anhydrite, or, where that is absent, the Roxby Formation."@en . "Limestone, dolomitic, grey with abundant Calcinema."@en . . "Seaham Formation"@en . "Brotherton Formation"@en . . . . "BTH"@en . . "274.4"^^ . "0-20m"@en . . . . "Brotherton Formation"@en . "Upper Magnesium Limestone [Obsolete: use BTH]"@en . . . . "Dolomitic limestone and dolostone and trace anhydrite-stone and mudstone. Stratified bedrock. Occurs onshore. Deposited during the Guadalupian Epoch - to - Lopingian Epoch (Permian Period) (274.4-251.9 Ma BP)."@en . . "Brotherton Beds [Obsolete: use BTH]"@en . "stable"@en . "251.9"^^ .