. . "The upper boundary is defined by the top of the Nansen Fomation, which is placed at a downward change from mudstones of the Dunlin Group (Amundsen or Darwin formations) to sandstones."@en . "Up to 360 m in the East Shetland Basin and up to 155 m in the Beryl Embayment."@en . "Banks Group"@en . . "Banks Group"@en . "BAKS"@en . "Statfjord Group [Obsolete: use BAKS]"@en . . "The lower boundary is defined by the base of the Statfjord Formation. Where that formation is absent (e.g. East Shetland Basin), the arenaceous Nansen Formation rests on Triassic red, argillaceous strata (Cormorant Formation)."@en . . "Sandstone with subsidiary mudstone and siltstone. Stratified bedrock. Occurs offshore. Deposited during the Rhaetian Age (Triassic Period) - to - Sinemurian Age (Jurassic Period) (205.7-192.9 Ma BP)."@en . "The group comprises interbedded sandstones, siltstones and mudstones of the Statfjord Formation, which are overlain by sandstones of the Nansen Formation."@en . . . "192.9"^^ . "stable"@en . . "205.7"^^ .