. . "48.1"^^ . . . . "Sand with subsidiary clay, gravel and sandstone. Stratified bedrock. Occurs onshore. Deposited during the Ypresian Age (Palaeogene Period) (56-48.1 Ma BP)."@en . . "Most of the Bagshot Formation is composed of pale yellow-brown to pale grey or white, locally orange or crimson, fine- to coarse-grained sand that is frequently micaceous and locally clayey, with sparse glauconite and sparse seams of gravel. The sands are commonly cross-bedded but some are laminated. Thin beds and lenses of laminated pale grey to white sandy or silty clay or clay (‘pipe-clay’) occur sporadically, becoming thicker towards the top of the formation. A thick clay bed, the Swinley Clay Member, is included at the top. In places, there is a basal bed of gravelly coarse-grained sand. There is a sparse fossil fauna of mostly indeterminate marine molluscs, with some indistinct plant remains (Curry, 1958; Hawkins, 1954), but most organic material has been destroyed by oxidation or dissolution. The higher part of the interval in the Bracknell Borehole (SU86NE42) [SU 8888 6547] is predominantly bioturbated, with frequent Ophiomorpha burrows (King, unpublished report to BGS, 1996; (Ellison and Williamson, 1999, fig. 6).\r\nAs mapped by BGS, in places the lower part of the Bagshot Formation probably includes an interval of bioturbated sandy clay, silt and fine-grained sand overlying a unit of fine- to coarse-grained sand (Bracknell Member of King, in prep.), both of which are placed in the topmost London Clay Formation by King (in prep.).\r\nA temporary section near the M3 in Surrey, described by Goldring et al. (1978), exposed interlayered sands and muds, fine sands, channel-fill sands and intraformational (mainly mud clast) conglomerates. The facies showed rapid lateral and vertical changes in grain size and bed form and a restricted suite of trace fossils including Ophiomorpha nodosa and Arenicolites sp. The part of the formation that this section represents is not known."@en . "BGS"@en . "The top of the Bagshot Formation is an erosional surface at the top of the Swinley Clay Member, marking a change to the glauconitic sands of the lower part of the Windlesham Formation. In the outliers in the north of London, and to the east, the Bagshot Formation is the youngest part of the Palaeogene succession and the upper part has been eroded."@en . "The base of the Bagshot Formation is marked by an erosional surface marking a change from clay, silt and fine-grained sand of the Claygate Member (London Clay Formation) to thick-bedded, pale-coloured, fine-grained sands, with a basal fine gravelly sand developed in places. Locally, erosion has removed the topmost parts of the Claygate Member."@en . . "Lower Bagshot Beds [Obsolete: use BGS]"@en . "56.0"^^ . "stable"@en . . . . . "Bagshot Sands [Obsolete: use BGS]"@en . "Bagshot Formation"@en . "Bagshot Beds [Obsolete: use BGS, BRB]"@en . "Bagshot Formation"@en . . "Up to about 45m to the south-west of London, where overlain by the Windlesham Formation."@en . .