"5m"@en . "Marine siltstones and sandstones replace the marine-brackish mudstones of the Upper Ostrea Member."@en . . "Belemnite Sands Member"@en . "stable"@en . . "Belemnite Sands Member"@en . "BSSK"@en . . . "Sandstone, siltstone and silty sandstone and trace carbonaceous argillaceous sandstone. Stratified bedrock. Occurs onshore. Deposited during the Callovian Age (Jurassic Period) (165.3-161.5 Ma BP)."@en . . "Sharp boundary, overlain by bituminous fissile mudstones of the Dunans Shale Member."@en . "165.3"^^ . "Siltstones and sandstones with a diverse bivalve fauna, belemnites and rare ammonites. A plesiosaur has also been found. The sandstones are commonly bioturbated, with local, small-scale cross-bedding and flaser bedding. One interpretation of the Member is that it was a migrating offshore sand bar, transgressing over the coastal lagoons described by 'Upper Ostrea Member'."@en . . . "161.5"^^ . .