"41.0"^^ . "stable"@en . . . "Branksome Sand Formation"@en . . . "Sand with subsidiary clay. Stratified bedrock. Occurs onshore. Deposited during the Lutetian Age (Palaeogene Period) (48.1-41 Ma BP)."@en . . "Bournemouth Freshwater Beds [Obsolete: use BRKS]"@en . . "48.1"^^ . . "Bournemouth Marine Beds [Obsolete: use BRKS]"@en . "BRKS"@en . "Branksome Sand Formation"@en . . "Up to 70m."@en . "The upper surface is a generally planar erosion surface representing a marine transgression cutting across the finely-interbedded sands and clays of the formation. This surface is overlain by fine-grained, well-sorted sand with bidirectional cross-bedding of the Boscombe Sand Formation."@en . "On the mainland the formation rests on an erosion surface on the Parkstone Clay Member of the Poole Formation. In the Isle of Wight the formation rests on an erosion surface at the top of the Marsh Farm Formation of the Bracklesham Group."@en . . . "The Branksome Formation comprises mainly interbedded cross-bedded fine- to coarse-grained sand and heterolithic (mixed grain-size) sediments, with subordinate kaolinitic clay (‘pipeclay’), organic-rich clay and rooted lignites, mainly as lenticular units (a complex of white and yellow sands, laminated carbonaceous clays and loams, and thin impure pipe-clays, arranged for the most part in overlapping lenses)."@en .